refactor(skills): 移动SkillRepository到repositories层

解决跨模块循环导入问题，将技能仓储类从agents/skills目录下沉到通用repositories目录，统一仓储层代码位置

backend/package/yuxi/agents/middlewares/skills.py

@@ -15,7 +15,7 @@ from langgraph.types import Command
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from yuxi.agents.mcp.service import get_enabled_mcp_tools
-from yuxi.agents.skills.repository import SkillRepository
+from yuxi.repositories.skill_repository import SkillRepository
 from yuxi.agents.skills.service import is_valid_skill_slug, list_accessible_skills, normalize_string_list
 from yuxi.agents.toolkits import get_all_tool_instances
 from yuxi.storage.postgres.manager import pg_manager

backend/package/yuxi/agents/skills/service.py

@@ -19,7 +19,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from yuxi import config as sys_config
 from yuxi.agents.mcp.service import get_enabled_mcp_server_slugs
-from yuxi.agents.skills.repository import SkillRepository
+from yuxi.repositories.skill_repository import SkillRepository
 from yuxi.storage.postgres.models_business import Skill, User
 from yuxi.utils.logging_config import logger
 from yuxi.utils.share_config import SHARE_ACCESS_LEVELS, normalize_share_config

backend/package/yuxi/repositories/skill_repository.py

@@ -1,6 +1,13 @@
+"""Skill 数据仓库。
+
+将 ``SkillRepository`` 下沉到 ``repositories`` 层，避免 ``external_systems/services``
+直接依赖 ``agents/skills`` 上层模块导致的跨层循环导入风险。
+"""
+
 from __future__ import annotations
 
-from sqlalchemy import select
+from sqlalchemy import cast, select
+from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from yuxi.storage.postgres.models_business import Skill
@@ -30,6 +37,19 @@ class SkillRepository:
         item_map = {item.slug: item for item in items}
         return [item_map[slug] for slug in normalized if slug in item_map]
 
+    async def list_by_tool_slugs(self, tool_slugs: list[str]) -> list[Skill]:
+        """根据工具 slug 列表查找依赖了其中任意工具的 Skill。
+
+        使用 PostgreSQL JSONB 的 ?| 操作符在数据库层过滤，避免全表加载。
+        """
+        if not tool_slugs:
+            return []
+        stmt = select(Skill).where(
+            cast(Skill.tool_dependencies, JSONB).has_any(tool_slugs),
+        )
+        result = await self.db.execute(stmt)
+        return list(result.scalars().all())
+
     async def get_by_slug(self, slug: str, *, for_update: bool = False) -> Skill | None:
         stmt = select(Skill).where(Skill.slug == slug)
         if for_update: