diff --git a/app/adapters/external/market.py b/app/adapters/external/market.py
index ecf98d20e..23cb67251 100644
--- a/app/adapters/external/market.py
+++ b/app/adapters/external/market.py
@@ -2467,14 +2467,15 @@ class PluginHelper(metaclass=WeakSingleton):
         """异步恢复主程序运行依赖，避免修复命令绕过可取消进程边界。"""
         repair_target = snapshot_file
         repair_desc = "主程序依赖快照"
-        if repair_target and not repair_target.exists():
+        if repair_target and not await _await_thread_operation(repair_target.exists):
             repair_target = None
         if repair_target is None:
             repair_target = settings.ROOT_PATH / "pyproject.toml"
             repair_desc = "主程序 uv.lock"
-        if not repair_target.exists():
+        if not await _await_thread_operation(repair_target.exists):
             return False, f"恢复依赖文件不存在：{repair_target}"
-        if snapshot_file is None and not (settings.ROOT_PATH / "uv.lock").exists():
+        lock_file = settings.ROOT_PATH / "uv.lock"
+        if snapshot_file is None and not await _await_thread_operation(lock_file.exists):
             return False, f"恢复依赖文件不存在：{settings.ROOT_PATH / 'uv.lock'}"
 
         request = cls.__build_package_install_request(
@@ -2568,7 +2569,7 @@ class PluginHelper(metaclass=WeakSingleton):
         candidate_dirs = []
         for dependency_file in resolved_dependency_files:
             wheels_dir = dependency_file.parent / "wheels"
-            if wheels_dir.is_dir():
+            if await _await_thread_operation(wheels_dir.is_dir):
                 candidate_dirs.append(wheels_dir)
         if find_links_dirs:
             candidate_dirs.extend(find_links_dirs)
@@ -2577,9 +2578,11 @@ class PluginHelper(metaclass=WeakSingleton):
         seen_dirs = set()
         for candidate_dir in candidate_dirs:
             candidate_path = Path(candidate_dir)
-            if not candidate_path.is_dir():
+            if not await _await_thread_operation(candidate_path.is_dir):
                 continue
-            candidate_key = str(candidate_path.resolve())
+            candidate_key = str(
+                await _await_thread_operation(candidate_path.resolve)
+            )
             if candidate_key in seen_dirs:
                 continue
             seen_dirs.add(candidate_key)
@@ -2707,7 +2710,10 @@ class PluginHelper(metaclass=WeakSingleton):
             if acquired:
                 cls._package_install_lock.release()
             if constraints_file:
-                constraints_file.unlink(missing_ok=True)
+                await _await_thread_operation(
+                    constraints_file.unlink,
+                    missing_ok=True,
+                )
 
     async def __async_backup_plugin(self, pid: str) -> str:
         """
diff --git a/app/api/endpoints/plugin.py b/app/api/endpoints/plugin.py
index 951d23455..091de1f50 100644
--- a/app/api/endpoints/plugin.py
+++ b/app/api/endpoints/plugin.py
@@ -57,7 +57,7 @@ from app.api.dependencies.plugin import (
 from app.adapters.external.server import MoviePilotServerHelper
 from app.adapters.external.market import PluginHelper
 from app.adapters.system.plugin.package import PluginPackageManager
-from app.application.database import DatabaseWorkerOverloadedError
+from app.schemas.exception import DatabaseWorkerOverloadedError
 from app.runtime.log import logger
 from app.schemas.types import SystemConfigKey
 
diff --git a/app/application/database.py b/app/application/database.py
index 78e6dafa5..d69414d27 100644
--- a/app/application/database.py
+++ b/app/application/database.py
@@ -18,14 +18,6 @@ DatabaseProbe = Callable[[], Optional[str]]
 T = TypeVar("T")
 
 
-class DatabaseWorkerClosedError(RuntimeError):
-    """数据库执行器尚未启动或已经停止。"""
-
-
-class DatabaseWorkerOverloadedError(RuntimeError):
-    """数据库执行器的运行与排队容量已经用尽。"""
-
-
 class AsyncDatabaseExecutor(Protocol):
     """让异步业务调用同步短事务而不阻塞事件循环。"""
 
diff --git a/app/application/messaging/chat.py b/app/application/messaging/chat.py
index bdb831348..5a8b3cb22 100644
--- a/app/application/messaging/chat.py
+++ b/app/application/messaging/chat.py
@@ -10,10 +10,12 @@ from weakref import WeakValueDictionary
 
 from app.application.database import (
     AsyncDatabaseExecutor,
+)
+from app.schemas.agent import AgentChatSessionDetail, AgentChatSessionSummary
+from app.schemas.exception import (
     DatabaseWorkerClosedError,
     DatabaseWorkerOverloadedError,
 )
-from app.schemas.agent import AgentChatSessionDetail, AgentChatSessionSummary
 from app.runtime.observability import record_metric
 
 
diff --git a/app/application/plugin/install.py b/app/application/plugin/install.py
index c33f40bd3..f858d2b9e 100644
--- a/app/application/plugin/install.py
+++ b/app/application/plugin/install.py
@@ -7,7 +7,7 @@ from collections.abc import Awaitable, Callable
 from dataclasses import dataclass, field
 from typing import Any, Optional
 
-from app.application.database import DatabaseWorkerOverloadedError
+from app.schemas.exception import DatabaseWorkerOverloadedError
 from app.application.plugin.lifecycle import plugin_lifecycle
 from app.runtime.log import logger
 
diff --git a/app/db/worker.py b/app/db/worker.py
index 1690df663..122366f42 100644
--- a/app/db/worker.py
+++ b/app/db/worker.py
@@ -10,7 +10,7 @@ from contextvars import copy_context
 from dataclasses import dataclass
 from typing import Callable, TypeVar
 
-from app.application.database import (
+from app.schemas.exception import (
     DatabaseWorkerClosedError,
     DatabaseWorkerOverloadedError,
 )
diff --git a/app/factory.py b/app/factory.py
index 7db6a5e82..12a06b8bd 100644
--- a/app/factory.py
+++ b/app/factory.py
@@ -14,7 +14,7 @@ from app.adapters.observability.otel import build_observation_port
 from app.adapters.web.plugin.routes import FastAPIDynamicRouteRegistry
 from app.adapters.web.health import install_health_routes
 from app.application.plugin.routes import configure_plugin_routes
-from app.application.database import (
+from app.schemas.exception import (
     DatabaseWorkerClosedError,
     DatabaseWorkerOverloadedError,
 )
diff --git a/app/schemas/exception.py b/app/schemas/exception.py
index f51b5759e..066109517 100644
--- a/app/schemas/exception.py
+++ b/app/schemas/exception.py
@@ -47,6 +47,14 @@ class StorageQueryError(Exception):
     pass
 
 
+class DatabaseWorkerClosedError(RuntimeError):
+    """数据库执行器尚未启动或已经停止。"""
+
+
+class DatabaseWorkerOverloadedError(RuntimeError):
+    """数据库执行器的运行与排队容量已经用尽。"""
+
+
 class TMDbException(Exception):
     """
     用于表示TheMovieDB数据源请求失败的跨层异常契约。
diff --git a/app/schemas/exports.py b/app/schemas/exports.py
index 25e8d04f1..946467c21 100644
--- a/app/schemas/exports.py
+++ b/app/schemas/exports.py
@@ -81,6 +81,8 @@ SCHEMA_EXPORTS = {
     'DashboardMemoryInfo': ('app.schemas.dashboard', 'DashboardMemoryInfo'),
     'DashboardSystemInfo': ('app.schemas.dashboard', 'DashboardSystemInfo'),
     'DataT': ('app.schemas.response', 'DataT'),
+    'DatabaseWorkerClosedError': ('app.schemas.exception', 'DatabaseWorkerClosedError'),
+    'DatabaseWorkerOverloadedError': ('app.schemas.exception', 'DatabaseWorkerOverloadedError'),
     'Dict': ('app.schemas.mcp', 'Dict'),
     'DiscoverMediaSource': ('app.schemas.event', 'DiscoverMediaSource'),
     'DiscoverSourceEventData': ('app.schemas.event', 'DiscoverSourceEventData'),
diff --git a/tests/fixtures/architecture/dependency-baseline.json b/tests/fixtures/architecture/dependency-baseline.json
index abf4f749c..9ea776895 100644
--- a/tests/fixtures/architecture/dependency-baseline.json
+++ b/tests/fixtures/architecture/dependency-baseline.json
@@ -13,8 +13,8 @@
     "runtime_to_db": [],
     "workflow_to_db": []
   },
-  "edge_count": 6440,
-  "edge_sha256": "93995005b1d5d1da95e9ec73a39c1d92e8e8e3e3ce3751ce1035e3f31103350d",
+  "edge_count": 6451,
+  "edge_sha256": "9075d8717e384580cd6a41bc36685438770db4a8d8f18c57e6c494f32937113a",
   "edges": [
     "app -> app.runtime",
     "app -> app.runtime.compat",
@@ -237,6 +237,8 @@
     "app.agent.mcp -> app.schemas.types",
     "app.agent.memory -> app.application",
     "app.agent.memory -> app.application.agentdata",
+    "app.agent.memory -> app.application.messaging",
+    "app.agent.memory -> app.application.messaging.chat",
     "app.agent.memory -> app.runtime",
     "app.agent.memory -> app.runtime.log",
     "app.agent.memory -> app.runtime.settings",
@@ -345,6 +347,8 @@
     "app.agent.orchestrator -> app.agent.tools.impl.query_system_settings",
     "app.agent.orchestrator -> app.application",
     "app.agent.orchestrator -> app.application.agentdata",
+    "app.agent.orchestrator -> app.application.messaging",
+    "app.agent.orchestrator -> app.application.messaging.chat",
     "app.agent.orchestrator -> app.application.plugin",
     "app.agent.orchestrator -> app.application.plugin.runtime",
     "app.agent.orchestrator -> app.chain",
@@ -2052,7 +2056,6 @@
     "app.api.endpoints.plugin -> app.application",
     "app.api.endpoints.plugin -> app.application.commands",
     "app.api.endpoints.plugin -> app.application.configuration",
-    "app.api.endpoints.plugin -> app.application.database",
     "app.api.endpoints.plugin -> app.application.plugin",
     "app.api.endpoints.plugin -> app.application.plugin.config",
     "app.api.endpoints.plugin -> app.application.plugin.folders",
@@ -2068,6 +2071,7 @@
     "app.api.endpoints.plugin -> app.runtime.log",
     "app.api.endpoints.plugin -> app.schemas",
     "app.api.endpoints.plugin -> app.schemas.common",
+    "app.api.endpoints.plugin -> app.schemas.exception",
     "app.api.endpoints.plugin -> app.schemas.plugin",
     "app.api.endpoints.plugin -> app.schemas.response",
     "app.api.endpoints.plugin -> app.schemas.token",
@@ -2553,8 +2557,13 @@
     "app.application.mediaserver -> app.schemas.types",
     "app.application.messaging.agent -> app.schemas",
     "app.application.messaging.agent -> app.schemas.types",
+    "app.application.messaging.chat -> app.application",
+    "app.application.messaging.chat -> app.application.database",
+    "app.application.messaging.chat -> app.runtime",
+    "app.application.messaging.chat -> app.runtime.observability",
     "app.application.messaging.chat -> app.schemas",
     "app.application.messaging.chat -> app.schemas.agent",
+    "app.application.messaging.chat -> app.schemas.exception",
     "app.application.messaging.interaction -> app.schemas",
     "app.application.messaging.interaction -> app.schemas.message",
     "app.application.messaging.interaction -> app.schemas.notification",
@@ -2641,11 +2650,12 @@
     "app.application.plugin.folders -> app.schemas",
     "app.application.plugin.folders -> app.schemas.types",
     "app.application.plugin.install -> app.application",
-    "app.application.plugin.install -> app.application.database",
     "app.application.plugin.install -> app.application.plugin",
     "app.application.plugin.install -> app.application.plugin.lifecycle",
     "app.application.plugin.install -> app.runtime",
     "app.application.plugin.install -> app.runtime.log",
+    "app.application.plugin.install -> app.schemas",
+    "app.application.plugin.install -> app.schemas.exception",
     "app.application.recognition -> app.application",
     "app.application.recognition -> app.application.configuration",
     "app.application.recognition -> app.schemas",
@@ -3675,10 +3685,10 @@
     "app.db.session -> app.runtime.config",
     "app.db.session -> app.runtime.log",
     "app.db.session -> app.runtime.observability",
-    "app.db.worker -> app.application",
-    "app.db.worker -> app.application.database",
     "app.db.worker -> app.runtime",
     "app.db.worker -> app.runtime.observability",
+    "app.db.worker -> app.schemas",
+    "app.db.worker -> app.schemas.exception",
     "app.doctor.checks -> app.adapters",
     "app.doctor.checks -> app.adapters.system",
     "app.doctor.checks -> app.adapters.system.backup",
@@ -3802,7 +3812,6 @@
     "app.factory -> app.api",
     "app.factory -> app.api.response",
     "app.factory -> app.application",
-    "app.factory -> app.application.database",
     "app.factory -> app.application.plugin",
     "app.factory -> app.application.plugin.routes",
     "app.factory -> app.application.security",
@@ -3816,6 +3825,7 @@
     "app.factory -> app.runtime.observability",
     "app.factory -> app.runtime.settings",
     "app.factory -> app.schemas",
+    "app.factory -> app.schemas.exception",
     "app.factory -> app.schemas.mcp",
     "app.factory -> app.schemas.openai",
     "app.factory -> app.schemas.response",
@@ -6094,6 +6104,7 @@
     "app.startup.modules_initializer -> app.application.history",
     "app.startup.modules_initializer -> app.application.image",
     "app.startup.modules_initializer -> app.application.messaging",
+    "app.startup.modules_initializer -> app.application.messaging.agent",
     "app.startup.modules_initializer -> app.application.messaging.chat",
     "app.startup.modules_initializer -> app.application.messaging.message",
     "app.startup.modules_initializer -> app.application.module",
diff --git a/tests/test_agent_chat_persistence.py b/tests/test_agent_chat_persistence.py
index 513a21172..bee1bd917 100644
--- a/tests/test_agent_chat_persistence.py
+++ b/tests/test_agent_chat_persistence.py
@@ -11,7 +11,7 @@ from uuid import uuid4
 import pytest
 from sqlalchemy import delete, select
 
-from app.application.database import (
+from app.schemas.exception import (
     DatabaseWorkerClosedError,
     DatabaseWorkerOverloadedError,
 )
diff --git a/tests/test_api_response.py b/tests/test_api_response.py
index 78a3ee335..715aadf9e 100644
--- a/tests/test_api_response.py
+++ b/tests/test_api_response.py
@@ -23,7 +23,7 @@ from app.factory import (
     localized_unhandled_exception_handler,
     localized_validation_exception_handler,
 )
-from app.application.database import (
+from app.schemas.exception import (
     DatabaseWorkerClosedError,
     DatabaseWorkerOverloadedError,
 )
diff --git a/tests/test_database_worker.py b/tests/test_database_worker.py
index 156862610..4e755980c 100644
--- a/tests/test_database_worker.py
+++ b/tests/test_database_worker.py
@@ -6,8 +6,8 @@ from unittest.mock import patch
 
 import pytest
 
-from app.db.worker import (
-    DatabaseWorker,
+from app.db.worker import DatabaseWorker
+from app.schemas.exception import (
     DatabaseWorkerClosedError,
     DatabaseWorkerOverloadedError,
 )
diff --git a/tests/test_plugin_install_command.py b/tests/test_plugin_install_command.py
index 7830ffdcb..d1736662a 100644
--- a/tests/test_plugin_install_command.py
+++ b/tests/test_plugin_install_command.py
@@ -3,7 +3,7 @@ from unittest.mock import AsyncMock, Mock
 
 import pytest
 
-from app.application.database import DatabaseWorkerOverloadedError
+from app.schemas.exception import DatabaseWorkerOverloadedError
 from app.application.plugin.install import PluginInstallCommand