feat: 客户亮灯表 + AI 周报摘要 — v0.2

亮灯表:
- 四色覆盖矩阵: 绿亮灯/黄临期/红灭灯/灰未分配
- 按客户经理折叠卡片流, 覆盖率进度条, 团队总览统计
- 红灯客户显示连续未拜访月份, 未分配客户专区
- 后端: light_board.py service + GET /api/dashboard/light-board
- 前端: LightBoard.vue + 路由 /light-board + 汇总侧边栏

AI 周报摘要:
- 接入 OpenAI 兼容大模型, 注入拜访数据+亮灯表覆盖数据
- 四段式结构化输出: 概况/需求/覆盖分析/建议
- 一键生成+Markdown渲染+复制纯文本
- 支局长/分管领导专用, 支持配置内部模型
- 后端: ai_summary.py service + POST /api/ai/summary
- 前端: WeeklyReport 集成按钮+结果面板
- 新增配置: AI_API_URL / AI_API_KEY / AI_MODEL

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

backend/app/api/dashboard.py

@@ -6,6 +6,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.database import get_db
 from app.middleware.auth import get_current_user
 from app.services.dashboard import get_dashboard_stats, get_reporting_progress, get_weekly_report
+from app.services.light_board import get_light_board
 
 router = APIRouter(prefix="/dashboard", tags=["Dashboard"])
 
@@ -51,3 +52,14 @@ async def weekly_report(
         filter_customer_id=uuid.UUID(customer_id) if customer_id else None,
         reference_date=ref,
     )
+
+
+@router.get("/light-board")
+async def light_board(
+    reference_date: Optional[str] = Query(None),
+    current_user: dict = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    """Get customer visit coverage matrix (light board). Director/leader only."""
+    ref = date.fromisoformat(reference_date) if reference_date else None
+    return await get_light_board(db, ref)