refactor: 收口 V3 分层架构与插件兼容边界

app/startup/agent_initializer.py

@@ -8,13 +8,29 @@ from app.agent.runtime_loader import (
     is_tool_factory_materialized,
     reconcile_agent_service,
 )
+from app.agent.llm.gateway import register_llm_provider_runtime
 from app.application.agent import register_agent_service_providers
+from app.application.messaging.skill import register_skill_catalog_provider
 from app.runtime.config import settings
 from app.runtime.events import Event, eventmanager
 from app.runtime.log import logger
 from app.schemas.types import EventType
 
 
+def _get_skill_catalog() -> Any:
+    """按需返回 Agent 技能目录实现，供消息应用层消费端口。"""
+    from app.agent.skills.registry import SkillHelper
+
+    return SkillHelper()
+
+
+def _get_llm_provider_runtime() -> Any:
+    """按需返回 LLM provider 运行时，实现只在真实调用边界加载。"""
+    from app.agent.llm.provider import LLMProviderManager
+
+    return LLMProviderManager()
+
+
 # 嵌入式启动器可显式注入 manager；常规进程使用 Capability Runtime。
 agent_manager: Any = None
 
@@ -169,6 +185,8 @@ register_agent_service_providers(
     llm_helper_provider=_get_llm_helper,
     manual_redo_prompt_builder_provider=_get_manual_redo_prompt_builder,
 )
+register_skill_catalog_provider(_get_skill_catalog)
+register_llm_provider_runtime(_get_llm_provider_runtime)
 
 
 async def init_agent() -> bool: