feat: 系统设置新增通报时间配置 + 亮灯表30天滚动窗口 + 相关人员文案统一 + 周报数据补全

- 亮灯表从自然月改为30天滚动窗口（30/60天阈值），解决月底覆盖断崖
- 系统设置新增「定时通报时间」选择器，支局长可配置每日企微通报时刻
- 新增 SystemConfig 键值表 + scheduler_manager APScheduler 运行时重调度
- 拜访记录/导入模板/弹窗表单统一「同访人员」→「相关人员」
- 仪表盘周报数据补全：companion_names_resolved、visitor_name/phone 等字段
- 新增 weekly_report_template.xlsx 模板文件

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

backend/app/api/system_config.py

@@ -0,0 +1,85 @@
+"""System configuration API — get/set runtime settings like notification time."""
+
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select
+from app.database import get_db
+from app.middleware.auth import get_current_user, require_director
+from app.models.system_config import SystemConfig
+from app.services.scheduler_manager import reschedule_daily_check
+
+router = APIRouter(prefix="/system-config", tags=["SystemConfig"])
+
+DEFAULT_NOTIFICATION_TIME = "17:30"
+
+
+def _parse_time(time_str: str) -> tuple[int, int]:
+    """Parse 'HH:MM' string to (hour, minute). Raises ValueError on bad input."""
+    parts = time_str.strip().split(":")
+    if len(parts) != 2:
+        raise ValueError("时间格式必须为 HH:MM")
+    h, m = int(parts[0]), int(parts[1])
+    if not (0 <= h <= 23 and 0 <= m <= 59):
+        raise ValueError("小时 0-23，分钟 0-59")
+    return h, m
+
+
+async def _get_config(db: AsyncSession, key: str) -> str | None:
+    row = await db.get(SystemConfig, key)
+    return row.value if row else None
+
+
+async def _set_config(db: AsyncSession, key: str, value: str):
+    row = await db.get(SystemConfig, key)
+    if row:
+        row.value = value
+    else:
+        db.add(SystemConfig(key=key, value=value))
+    await db.commit()
+
+
+async def get_notification_time(db: AsyncSession) -> str:
+    """Read notification_time from DB, falling back to default."""
+    val = await _get_config(db, "notification_time")
+    return val if val else DEFAULT_NOTIFICATION_TIME
+
+
+@router.get("")
+async def list_config(db: AsyncSession = Depends(get_db)):
+    """Return all system config as {key: value} dict."""
+    result = await db.execute(select(SystemConfig))
+    rows = result.scalars().all()
+    config = {r.key: r.value for r in rows}
+    # Ensure notification_time always has a value
+    if "notification_time" not in config:
+        config["notification_time"] = DEFAULT_NOTIFICATION_TIME
+    return config
+
+
+@router.put("/{key}")
+async def update_config(
+    key: str,
+    body: dict,
+    current_user: dict = Depends(require_director),
+    db: AsyncSession = Depends(get_db),
+):
+    """Update a single config key. Only directors can change settings."""
+    value = body.get("value", "")
+    valid_keys = {"notification_time"}
+
+    if key not in valid_keys:
+        raise HTTPException(status_code=400, detail=f"不支持的配置项: {key}")
+
+    if key == "notification_time":
+        try:
+            h, m = _parse_time(value)
+        except ValueError as e:
+            raise HTTPException(status_code=400, detail=str(e))
+        # Persist to DB
+        await _set_config(db, key, value)
+        # Reschedule the APScheduler job
+        await reschedule_daily_check(h, m)
+        return {"key": key, "value": value, "scheduled": f"{h:02d}:{m:02d}"}
+
+    await _set_config(db, key, value)
+    return {"key": key, "value": value}