refactor: 前后端目录结构模块化 + v2 优化移植与缺陷修复

前端:
- src/srv/api → src/api，按域分文件夹(auth/cluster/host/storage/deployment/collector)
- 新增 http.ts 引擎(http.get/post/put/delete)，域模块改用语义化调用
- index.html 增加 favicon(匹配应用 logo 的 emerald + Activity 脉冲)

后端分层增强(保留包名):
- 新增 repository/：从 models 拆出 JsonDB 持久化层(InitDB/GetDB/Shutdown/RequestSave)
- 新增 dto/：从 controllers 抽出各域请求契约(带 binding 校验)
- 新增 pkg/crypto、pkg/jwt：从 utils 拆出安全原语(外部 jwt 别名 jwtv5 避免冲突)
- models 只留领域实体 + sanitizer；utils 只留 gin/应用相关(response/errors)

v2 优化移植与缺陷修复:
- 移植密钥分离/SSH TOFU/并发写安全/Loki 生产级配置/Docker 加固
- 修复 deployment.go 并发丢更新、Helm values 重复键、EncryptField 哨兵、loki-gateway 端点等审计缺陷
- 实现真正的优雅关停(main.go http.Server + signal + repository.Shutdown)
- 修复登录契约:后端返回 accessToken，前端 auth.ts/Login.tsx 对齐
- 补 crypto/jwt/repository 单元测试(含并发写回归)

验证: go build/vet/test 全绿；npm run build 通过；登录→鉴权→优雅关停冒烟通过

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

nginx.conf

@@ -0,0 +1,91 @@
+# Nginx Load Balancer Configuration for LokiDeploy Production
+# Simple round-robin load balancing between two app instances
+
+events {
+    worker_connections 1024;
+}
+
+http {
+    # Upstream for LokiDeploy app instances
+    upstream lokideploy_backend {
+        server lokideploy-1:8080 weight=5;
+        server lokideploy-2:8080 weight=5;
+
+        # Health check for upstream servers (nginx-plus) or passive checks
+        keepalive 32;
+    }
+
+    # Rate limiting zone
+    limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;
+    limit_req_zone $binary_remote_addr zone=auth_limit:10m rate=5r/m;
+
+    # Logging format
+    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
+                    '$status $body_bytes_sent "$http_referer" '
+                    '"$http_user_agent" rt=$request_time';
+
+    access_log /var/log/nginx/access.log main;
+    error_log /var/log/nginx/error.log warn;
+
+    # Security headers
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header X-XSS-Protection "1; mode=block" always;
+    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+
+    # Gzip compression
+    gzip on;
+    gzip_types text/plain text/css application/json application/javascript;
+
+    server {
+        listen 8080;
+        server_name _;
+
+        # Health check endpoint for nginx itself
+        location /health {
+            access_log off;
+            return 200 "healthy\n";
+            add_header Content-Type text/plain;
+        }
+
+        # Stricter rate limit for authentication
+        location /api/v1/auth/login {
+            limit_req zone=auth_limit burst=3 nodelay;
+            proxy_pass http://lokideploy_backend;
+            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;
+            proxy_connect_timeout 5s;
+            proxy_send_timeout 10s;
+            proxy_read_timeout 30s;
+        }
+
+        # General API rate limiting
+        location /api/ {
+            limit_req zone=api_limit burst=20 nodelay;
+            proxy_pass http://lokideploy_backend;
+            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;
+            proxy_connect_timeout 5s;
+            proxy_send_timeout 10s;
+            proxy_read_timeout 30s;
+        }
+
+        # Static files and all other routes
+        location / {
+            proxy_pass http://lokideploy_backend;
+            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;
+            proxy_connect_timeout 5s;
+            proxy_send_timeout 10s;
+            proxy_read_timeout 30s;
+            proxy_http_version 1.1;
+            proxy_set_header Connection "";
+        }
+    }
+}