diff --git a/backend/src/ws-gateways/ai-end/ai-end.gateway.ts b/backend/src/ws-gateways/ai-end/ai-end.gateway.ts
index 78573b5..3a37d50 100644
--- a/backend/src/ws-gateways/ai-end/ai-end.gateway.ts
+++ b/backend/src/ws-gateways/ai-end/ai-end.gateway.ts
@@ -1,4 +1,4 @@
-import { Inject, forwardRef } from '@nestjs/common';
+import { Inject, Logger, forwardRef } from '@nestjs/common';
 import {
   WebSocketServer,
   SubscribeMessage,
@@ -38,8 +38,13 @@ interface CameraConfig {
   serveClient: false,
 })
 export class AiEndGateway implements OnGatewayConnection, OnGatewayDisconnect {
+  private readonly logger = new Logger(AiEndGateway.name);
+
   @WebSocketServer()
   wsServer: Server;
+
+  connecetedClients: Map<string, Socket> = new Map();
+
   constructor(
     @Inject(forwardRef(() => CameraService))
     private cameraService: CameraService,
@@ -51,14 +56,12 @@ export class AiEndGateway implements OnGatewayConnection, OnGatewayDisconnect {
     private utilsService: UtilsService,
   ) {}
 
-  connecetedClients: Map<string, Socket> = new Map();
-
   @SubscribeMessage('message')
   handleMessage(
     @MessageBody() body: string,
     @ConnectedSocket() client: Socket,
   ) {
-    console.log('message received: ', body);
+    this.logger.log(`message received: ${body}`);
     client.emit('message', 'hello from server');
   }
 
@@ -67,11 +70,9 @@ export class AiEndGateway implements OnGatewayConnection, OnGatewayDisconnect {
     @MessageBody() body: AlarmData,
     @ConnectedSocket() client: Socket,
   ) {
-    console.log('alarm received: ');
-
     const { cameraID } = client.data as ClientInfo;
     const sourceCamera = new Camera();
-    sourceCamera.id = parseInt(cameraID);
+    sourceCamera.id = parseInt(cameraID, 10);
     const alarmRule = new AlarmRule();
     alarmRule.id = body.alarmRuleID;
 
@@ -93,13 +94,12 @@ export class AiEndGateway implements OnGatewayConnection, OnGatewayDisconnect {
       const config = await this.cameraService.getById(cameraID, true);
       if (!config) return;
       cameraConfig = {
-        alarmRules: config?.alarmRules ?? [],
+        alarmRules: config.alarmRules ?? [],
         rtspUrl: config.rtspUrl,
       };
     }
     client?.emit('cameraConfigChange', cameraConfig);
-
-    console.log(`notify ${cameraID} CameraConfigChange`);
+    this.logger.log(`notify ${cameraID} CameraConfigChange`);
   }
 
   async disconnectClient(cameraID: number) {
@@ -107,74 +107,83 @@ export class AiEndGateway implements OnGatewayConnection, OnGatewayDisconnect {
   }
 
   async handleConnection(@ConnectedSocket() client: Socket) {
+    let data: ClientInfo | undefined;
     try {
       if (typeof client.client.request.headers.data !== 'string') {
+        this.logger.warn('拒绝连接：缺少 data 请求头');
+        client.disconnect();
+        return;
+      }
+
+      data = JSON.parse(client.client.request.headers.data) as ClientInfo;
+      if (!data.cameraID) {
+        this.logger.warn('拒绝连接：缺少 cameraID');
         client.disconnect();
         return;
       }
-      const data: ClientInfo = JSON.parse(client.client.request.headers.data);
 
       const user = await this.userService.authLogin(
         data.username,
         data.password,
       );
-
       if (user?.role !== 'admin') {
+        this.logger.warn(
+          `拒绝连接：用户 ${data.username} 无管理员权限或鉴权失败`,
+        );
         client.disconnect();
         return;
       }
 
-      if (this.connecetedClients.has(data.cameraID)) {
-        this.connecetedClients.get(data.cameraID)?.disconnect();
+      const cameraID = parseInt(data.cameraID, 10);
+      if (!Number.isInteger(cameraID) || cameraID <= 0) {
+        this.logger.warn(`拒绝连接：非法 cameraID=${data.cameraID}`);
+        client.disconnect();
+        return;
+      }
+
+      const camera = await this.cameraService.getById(cameraID, false, false);
+      if (!camera) {
+        this.logger.warn(`拒绝连接：摄像头 ${data.cameraID} 不存在`);
+        client.disconnect();
+        return;
+      }
+
+      const oldClient = this.connecetedClients.get(data.cameraID);
+      if (oldClient && oldClient !== client) {
+        oldClient.disconnect();
         this.connecetedClients.delete(data.cameraID);
-        await sleep(1000);
       }
 
       client.data = data;
-
-      const camera = await this.cameraService.getById(
-        parseInt(data.cameraID),
-        false,
-        true,
-      );
-      if (!camera) {
-        client.disconnect();
-        return;
-      }
-
-      await this.cameraService.updateCamera({
-        id: parseInt(data.cameraID),
-        online: true,
-      });
-
+      await this.cameraService.updateCamera({ id: cameraID, online: true });
       this.connecetedClients.set(data.cameraID, client);
-
-      console.log(`client ${data.cameraID} connected`);
-
-      await this.notifyCameraConfigChange(parseInt(data.cameraID));
-    } catch {
+      this.logger.log(`client ${data.cameraID} connected`);
+      await this.notifyCameraConfigChange(cameraID);
+    } catch (error) {
+      const cameraID = data?.cameraID ?? 'unknown';
+      this.logger.error(
+        `摄像头 ${cameraID} 连接处理失败: ${String(error)}`,
+        error instanceof Error ? error.stack : undefined,
+      );
       client.disconnect();
     }
   }
 
   async handleDisconnect(@ConnectedSocket() client: Socket) {
-    this.connecetedClients.delete(client.data.cameraID);
+    const data = client.data as ClientInfo | undefined;
     client.removeAllListeners();
 
-    const data = client.data as ClientInfo;
-    await this.cameraService.updateCamera({
-      id: parseInt(data.cameraID),
-      online: false,
-    });
+    if (!data?.cameraID) return;
 
-    console.log(`client ${data.cameraID} disconnected`);
+    const currentClient = this.connecetedClients.get(data.cameraID);
+    if (currentClient === client) {
+      this.connecetedClients.delete(data.cameraID);
+    }
+
+    const cameraID = parseInt(data.cameraID, 10);
+    if (Number.isInteger(cameraID)) {
+      await this.cameraService.updateCamera({ id: cameraID, online: false });
+    }
+    this.logger.log(`client ${data.cameraID} disconnected`);
   }
 }
-
-const sleep = async (ms: number) => {
-  return new Promise((resolve) => {
-    setTimeout(() => {
-      resolve(null);
-    }, ms);
-  });
-};
diff --git a/docs/screenshots/ai-chat.png b/docs/screenshots/ai-chat.png
index a9089e9..4bac7e2 100644
Binary files a/docs/screenshots/ai-chat.png and b/docs/screenshots/ai-chat.png differ
diff --git a/docs/screenshots/ai-settings.png b/docs/screenshots/ai-settings.png
index e86cd32..59069dc 100644
Binary files a/docs/screenshots/ai-settings.png and b/docs/screenshots/ai-settings.png differ
diff --git a/docs/screenshots/alarm-rule-management.png b/docs/screenshots/alarm-rule-management.png
index ea14d10..c26e348 100644
Binary files a/docs/screenshots/alarm-rule-management.png and b/docs/screenshots/alarm-rule-management.png differ
diff --git a/docs/screenshots/alarms.png b/docs/screenshots/alarms.png
index ebc54fd..affcddd 100644
Binary files a/docs/screenshots/alarms.png and b/docs/screenshots/alarms.png differ
diff --git a/docs/screenshots/camera-management.png b/docs/screenshots/camera-management.png
index 62d722a..0f557a3 100644
Binary files a/docs/screenshots/camera-management.png and b/docs/screenshots/camera-management.png differ
diff --git a/docs/screenshots/campus-state.png b/docs/screenshots/campus-state.png
index 0ddaba6..1e1b18c 100644
Binary files a/docs/screenshots/campus-state.png and b/docs/screenshots/campus-state.png differ
diff --git a/docs/screenshots/login.png b/docs/screenshots/login.png
index 83a4db3..c949957 100644
Binary files a/docs/screenshots/login.png and b/docs/screenshots/login.png differ
diff --git a/docs/screenshots/map-management.png b/docs/screenshots/map-management.png
index 7e11e81..aa4fc37 100644
Binary files a/docs/screenshots/map-management.png and b/docs/screenshots/map-management.png differ
diff --git a/docs/screenshots/monitoring-screen.png b/docs/screenshots/monitoring-screen.png
index e033470..0fba78a 100644
Binary files a/docs/screenshots/monitoring-screen.png and b/docs/screenshots/monitoring-screen.png differ
diff --git a/docs/screenshots/overview.png b/docs/screenshots/overview.png
index eb42712..ab8a7cf 100644
Binary files a/docs/screenshots/overview.png and b/docs/screenshots/overview.png differ
diff --git a/docs/screenshots/user-info.png b/docs/screenshots/user-info.png
index e8feb6a..c1cf5ae 100644
Binary files a/docs/screenshots/user-info.png and b/docs/screenshots/user-info.png differ
diff --git a/docs/screenshots/user-management.png b/docs/screenshots/user-management.png
index 26e439b..be199bf 100644
Binary files a/docs/screenshots/user-management.png and b/docs/screenshots/user-management.png differ
diff --git a/front-backend.Dockerfile b/front-backend.Dockerfile
index edbaec8..3033e85 100644
--- a/front-backend.Dockerfile
+++ b/front-backend.Dockerfile
@@ -1,6 +1,7 @@
 FROM node:20-bookworm-slim
 
-ENV TZ=Asia/Shanghai
+ENV TZ=Asia/Shanghai \
+  NPM_CONFIG_REGISTRY=https://registry.npmmirror.com
 RUN echo $TZ > /etc/timezone && \
   ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && \
   dpkg-reconfigure -f noninteractive tzdata
@@ -11,7 +12,7 @@ COPY ./backend /usr/share/smart-parking-platform/backend
 
 WORKDIR /usr/share/smart-parking-platform/backend
 
-RUN npm i -g pnpm@8.15.0 && \
+RUN npm i -g pnpm@8.15.0 --registry=https://registry.npmmirror.com && \
   pnpm install --frozen-lockfile && \
   pnpm run build && \
   mkdir -p /var/www/html/public
@@ -21,4 +22,4 @@ COPY ./backend/nginx.conf /etc/nginx/nginx.conf
 
 EXPOSE 80 1515
 
-CMD service nginx start && pnpm run start:prod
\ No newline at end of file
+CMD service nginx start && pnpm run start:prod
diff --git a/frontend/src/components/hlsPlayer/index.module.less b/frontend/src/components/hlsPlayer/index.module.less
index 796a6f7..51cb388 100644
--- a/frontend/src/components/hlsPlayer/index.module.less
+++ b/frontend/src/components/hlsPlayer/index.module.less
@@ -1,5 +1,7 @@
 .player {
-  // hide the timeline
+  display: block;
+  background: #020617;
+
   &::-webkit-media-controls-timeline {
     display: none;
   }
diff --git a/frontend/src/pages/aiChat/index.tsx b/frontend/src/pages/aiChat/index.tsx
index 174c035..48fdb67 100644
--- a/frontend/src/pages/aiChat/index.tsx
+++ b/frontend/src/pages/aiChat/index.tsx
@@ -482,4 +482,4 @@ const AiChat: FC = () => {
   );
 };
 
-export default AiChat;
\ No newline at end of file
+export default AiChat;
diff --git a/frontend/src/pages/monitScreen/index.module.less b/frontend/src/pages/monitScreen/index.module.less
index a2a1f2c..fcbb020 100644
--- a/frontend/src/pages/monitScreen/index.module.less
+++ b/frontend/src/pages/monitScreen/index.module.less
@@ -1,7 +1,11 @@
 .content {
   padding: 8px;
 }
+
 .video {
+  display: block;
   width: 100%;
   height: 320px;
+  object-fit: cover;
+  background: #020617;
 }
diff --git a/simulator.Dockerfile b/simulator.Dockerfile
index 9c9e26b..535ba4c 100644
--- a/simulator.Dockerfile
+++ b/simulator.Dockerfile
@@ -1,18 +1,20 @@
 FROM node:20-bookworm-slim
 
-ENV TZ=Asia/Shanghai
+ENV TZ=Asia/Shanghai \
+  NPM_CONFIG_REGISTRY=https://registry.npmmirror.com
 RUN echo $TZ > /etc/timezone && \
   ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && \
   dpkg-reconfigure -f noninteractive tzdata
 
-# ffmpeg 用于向 nginx-rtMP 循环推流
+# ffmpeg 用于向 Nginx-RTMP 循环推流
 RUN apt-get update && apt-get install -y --no-install-recommends ffmpeg && \
   rm -rf /var/lib/apt/lists/*
 
 WORKDIR /simulator
 
 COPY simulator/package.json ./
-RUN npm install --omit=dev
+RUN npm config set registry https://registry.npmmirror.com && \
+  npm install --omit=dev
 
 COPY simulator/simulator.js ./
 COPY simulator/assets /assets