feat(agent): add ToolTag-based tags to all agent tools; implement tags.py for unified tool capability tagging

app/agent/tools/impl/install_plugin.py

@@ -6,6 +6,7 @@ from typing import Optional, Type
 from pydantic import BaseModel, Field
 
 from app.agent.tools.base import MoviePilotTool
+from app.agent.tools.tags import ToolTag
 from app.agent.tools.impl._plugin_tool_utils import (
     get_plugin_snapshot,
     install_plugin_runtime,
@@ -36,6 +37,11 @@ class InstallPluginInput(BaseModel):
 
 class InstallPluginTool(MoviePilotTool):
     name: str = "install_plugin"
+    tags: list[str] = [
+        ToolTag.Write,
+        ToolTag.Plugin,
+        ToolTag.Admin,
+    ]
     description: str = (
         "Install a plugin by exact plugin_id from the plugin market or local plugin repositories. "
         "Use query_market_plugins first when you need filtering or discovery."