fix: delete agent 500 error + dynamic personality + deployment guide

- Fix delete agent 500: clean up FK records (agent_llm_logs, permissions,
  schedules, executions, team_members) and unbind goals/tasks before delete
- Remove hardcoded personality templates in Android, replace with dynamic
  system prompt generation from name + description
- Set promptSectionsEnabled=false to bypass PromptComposer for personality
- Add Tencent Cloud Linux deployment guide (Docker Compose)
- Accumulated backend service updates, frontend UI fixes, Android app changes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/nginx-reverse-proxy.conf

@@ -0,0 +1,41 @@
+# Nginx 反向代理配置示例
+
+server {
+    listen 80;
+    server_name example.com;  # 替换为你的域名或IP
+
+    # 日志配置（可选）
+    access_log /var/log/nginx/proxy_access.log;
+    error_log  /var/log/nginx/proxy_error.log;
+
+    location / {
+        # 代理到后端服务
+        proxy_pass http://127.0.0.1:8080;  # 替换为实际后端地址
+
+        # 传递原始请求头
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+
+        # 超时设置（可选）
+        proxy_connect_timeout 30s;
+        proxy_read_timeout    60s;
+        proxy_send_timeout    60s;
+    }
+
+    # 静态资源直接由Nginx处理（可选）
+    location /static/ {
+        alias /var/www/static/;
+        expires 7d;
+    }
+
+    # WebSocket 反向代理（可选）
+    location /ws/ {
+        proxy_pass http://127.0.0.1:8081;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_set_header Host $host;
+    }
+}