修复：日报摄像头Top5显示代码而非名称

日报生成时直接读取IoT数据库的camera_name字段，该字段存的是
camera_code（如cam_2043d9aed65c），导致日报中摄像头名称
无法识别。

改为统一收集camera_id，通过camera_name_service批量调WVP API
解析真实名称，解析失败时降级使用camera_code。

app/services/daily_report_service.py

@@ -117,7 +117,7 @@ async def generate_daily_report() -> Optional[str]:
     type_count = {"SECURITY": 0, "CLEAN": 0}
     status_count = Counter()
     alarm_type_count = Counter()
-    camera_counter = Counter()
+    camera_code_counter = Counter()  # 先按 camera_code 统计
     false_alarm_count = 0
     response_times: List[float] = []
     cleaning_type_count = Counter()
@@ -132,10 +132,10 @@ async def generate_daily_report() -> Optional[str]:
         if sec_ext:
             if sec_ext.alarm_type:
                 alarm_type_count[sec_ext.alarm_type] += 1
-            if sec_ext.camera_name:
-                camera_counter[sec_ext.camera_name] += 1
-            elif sec_ext.camera_id:
-                camera_counter[sec_ext.camera_id] += 1
+            # 统一用 camera_id（即 camera_code）做 key，后续批量解析名称
+            cam_key = sec_ext.camera_id or sec_ext.camera_name
+            if cam_key:
+                camera_code_counter[cam_key] += 1
             if sec_ext.false_alarm == 1:
                 false_alarm_count += 1
             # 响应时长：dispatched → confirmed
@@ -149,6 +149,20 @@ async def generate_daily_report() -> Optional[str]:
         if clean_ext and clean_ext.cleaning_type:
             cleaning_type_count[clean_ext.cleaning_type] += 1
 
+    # 批量解析摄像头名称（camera_code → 真实名称）
+    camera_counter = Counter()
+    if camera_code_counter:
+        try:
+            from app.services.camera_name_service import get_camera_name_service
+            cam_svc = get_camera_name_service()
+            name_map = await cam_svc.get_display_names_batch(list(camera_code_counter.keys()))
+            for code, count in camera_code_counter.items():
+                display_name = name_map.get(code, code)
+                camera_counter[display_name] += count
+        except Exception as e:
+            logger.warning(f"摄像头名称解析失败，降级使用代码: {e}")
+            camera_counter = camera_code_counter
+
     # 环比
     if prev_total > 0:
         change_pct = (yesterday_total - prev_total) / prev_total * 100