feat: 累积功能变更 — 聊天集成、租户管理、小程序更新、ETL 增强、迁移脚本

包含多个会话的累积代码变更：
- backend: AI 聊天服务、触发器调度、认证增强、WebSocket、调度器最小间隔
- admin-web: ETL 状态页、任务管理、调度配置、登录优化
- miniprogram: 看板页面、聊天集成、UI 组件、导航更新
- etl: DWS 新任务（finance_area_daily/board_cache）、连接器增强
- tenant-admin: 项目初始化
- db: 19 个迁移脚本（etl_feiqiu 11 + zqyy_app 8）
- packages/shared: 枚举和工具函数更新
- tools: 数据库工具、报表生成、健康检查
- docs: PRD/架构/部署/合约文档更新

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/backend/app/routers/xcx_coaches.py

@@ -13,17 +13,20 @@ from __future__ import annotations
 from fastapi import APIRouter, Depends
 
 from app.auth.dependencies import CurrentUser
-from app.middleware.permission import require_approved
+from app.middleware.permission import require_permission
 from app.schemas.xcx_coaches import CoachDetailResponse
 from app.services import coach_service
+from app.trace.decorators import trace_service
 
 router = APIRouter(prefix="/api/xcx/coaches", tags=["小程序助教"])
 
 
 @router.get("/{coach_id}", response_model=CoachDetailResponse)
+@trace_service("获取助教详情", "Get coach detail")
 async def get_coach_detail(
     coach_id: int,
-    user: CurrentUser = Depends(require_approved()),
+    # CHANGE 2026-03-27 | 权限改造 W4：助教详情跟助教看板走
+    user: CurrentUser = Depends(require_permission("view_board_coach")),
 ):
     """助教详情（COACH-1）。"""
     return await coach_service.get_coach_detail(