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/ai_summary.py

@@ -0,0 +1,40 @@
+"""AI summary endpoints — LLM-powered weekly report narrative."""
+
+import uuid
+from datetime import date
+from typing import Optional
+from fastapi import APIRouter, Depends, Query, HTTPException
+from sqlalchemy.ext.asyncio import AsyncSession
+from app.database import get_db
+from app.middleware.auth import get_current_user
+from app.services.ai_summary import generate_summary
+
+router = APIRouter(prefix="/ai", tags=["AI Summary"])
+
+
+@router.post("/summary")
+async def ai_summary(
+    reference_date: Optional[str] = Query(None),
+    period: str = Query("week", regex="^(week|month)$"),
+    current_user: dict = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    """Generate AI-powered weekly report summary. Director/leader only."""
+    role = current_user["role"]
+    if role not in ("director", "leader"):
+        raise HTTPException(status_code=403, detail="仅限支局长和分管领导使用")
+
+    try:
+        ref = date.fromisoformat(reference_date) if reference_date else None
+        summary = await generate_summary(
+            db=db,
+            user_id=uuid.UUID(current_user["user_id"]),
+            role=role,
+            reference_date=ref,
+            period=period,
+        )
+        return {"summary": summary, "period": period, "reference_date": str(ref or date.today())}
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"AI 摘要生成失败：{str(e)}")