feat(agents): Phase 7-10 hook system, plugins, skills, orchestration

Phase 7: Built-in Hooks (audit_log, dangerous_confirmation, security_scan)
Phase 8: Plugin system (PluginManager, PluginSandbox, PluginManifest)
Phase 9: Skills registry (SkillRegistry, local/plugin/MCP loaders)
Phase 10: TeamLeader, RemoteTransport, BackgroundTaskManager

backend/app/agents/skills/loaders/plugin_loader.py

@@ -0,0 +1,51 @@
+"""插件 Skills 加载器 - Phase 9.2"""
+
+from app.agents.skills.metadata import SkillMetadata
+from app.agents.plugins.manager import get_plugin_manager
+
+
+class PluginSkillLoader:
+    """插件 Skills 加载器
+
+    从已安装的插件中加载 Skills。
+    """
+
+    def __init__(self):
+        self.plugin_manager = get_plugin_manager()
+
+    def load_all(self) -> list[SkillMetadata]:
+        """从所有已启用的插件加载 Skills
+
+        Returns:
+            Skill 元数据列表
+        """
+        skills = []
+
+        for plugin in self.plugin_manager.list_plugins():
+            if not self.plugin_manager.is_enabled(plugin.id):
+                continue
+
+            # 从插件加载 Skills
+            plugin_skills = self._load_from_plugin(plugin)
+            skills.extend(plugin_skills)
+
+        return skills
+
+    def _load_from_plugin(self, plugin: Any) -> list[SkillMetadata]:
+        """从单个插件加载 Skills"""
+        skills = []
+
+        for skill_name in plugin.skills:
+            skill = SkillMetadata(
+                name=f"{plugin.id}/{skill_name}",
+                description=f"Skill from plugin: {plugin.name}",
+                version=plugin.version,
+                author=plugin.author,
+                tags=["plugin", plugin.id],
+                content=f"# {skill_name}\n\nFrom plugin: {plugin.name}",
+                source="plugin",
+                source_id=plugin.id,
+            )
+            skills.append(skill)
+
+        return skills