Add batch management APIs, API security, rate limiting, and optimizations

- Batch device CRUD: POST /api/devices/batch (create 500), PUT /api/devices/batch (update 500),
  POST /api/devices/batch-delete (delete 100) with WHERE IN bulk queries
- Batch command: POST /api/commands/batch with model_validator mutual exclusion
- API key auth (X-API-Key header, secrets.compare_digest timing-safe)
- Rate limiting via SlowAPIMiddleware (60/min default, 30/min writes)
- Real client IP extraction (X-Forwarded-For / CF-Connecting-IP)
- Global exception handler (no stack trace leaks, passes HTTPException through)
- CORS with auto-disable credentials on wildcard origins
- Schema validation: IMEI pattern, lat/lon ranges, Literal enums, MAC/UUID patterns
- Heartbeats router, per-ID endpoints for locations/attendance/bluetooth
- Input dedup in batch create, result ordering preserved
- Baidu reverse geocoding, Gaode map tiles with WGS84→GCJ02 conversion
- Device detail panel with feature toggles and command controls
- Side panel for location/beacon pages with auto-select active device

via [HAPI](https://hapi.run)

Co-Authored-By: HAPI <noreply@hapi.run>

app/routers/attendance.py

@@ -185,3 +185,20 @@ async def device_attendance(
             total_pages=math.ceil(total / page_size) if total else 0,
         )
     )
+
+
+# NOTE: /{attendance_id} must be after /stats and /device/{device_id} to avoid route conflicts
+@router.get(
+    "/{attendance_id}",
+    response_model=APIResponse[AttendanceRecordResponse],
+    summary="获取考勤记录详情 / Get attendance record",
+)
+async def get_attendance(attendance_id: int, db: AsyncSession = Depends(get_db)):
+    """按ID获取考勤记录详情 / Get attendance record details by ID."""
+    result = await db.execute(
+        select(AttendanceRecord).where(AttendanceRecord.id == attendance_id)
+    )
+    record = result.scalar_one_or_none()
+    if record is None:
+        raise HTTPException(status_code=404, detail=f"Attendance {attendance_id} not found")
+    return APIResponse(data=AttendanceRecordResponse.model_validate(record))