feat: optimize docker-compose, add observability stack (Grafana/Loki/Prometheus), and host nginx config

configs/ppanel.yaml

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+# PPanel Server Configuration
+# 完整配置示例
+
+# 运行模式: debug, release, test
+Model: release
+# 监听地址
+Host: 0.0.0.0
+# 监听端口
+Port: 8080
+# 是否开启调试模式
+Debug: false
+
+# JWT 认证配置
+JwtAuth:
+  AccessSecret: "ppanel-secret-key-change-me" # 请务必修改此密钥
+  AccessExpire: 604800 # Token 过期时间 (秒), 默认 7 天
+  MaxSessionsPerUser: 3 # 每个用户最大并发登录数
+
+# 日志配置
+Logger:
+  ServiceName: "PPanel"
+  Mode: "file" # console, file, volume
+  Encoding: "json" # json, plain
+  Path: "logs" # 日志文件路径
+  Level: "info" # debug, info, warn, error
+  Compress: true
+  KeepDays: 7
+  Rotation: "daily" # daily, size
+
+# MySQL 数据库配置
+MySQL:
+  Addr: "mysql:3306" # Docker 服务名:端口
+  Username: "root"
+  Password: "ppanel_password" # 与 docker-compose 中的 MYSQL_ROOT_PASSWORD 保持一致
+  Dbname: "ppanel_db"
+  Config: "charset=utf8mb4&parseTime=true&loc=Asia%2FShanghai"
+  MaxIdleConns: 10
+  MaxOpenConns: 100
+  SlowThreshold: 1000 # 慢查询阈值 (ms)
+
+# Redis 配置
+Redis:
+  Host: "redis:6379" # Docker 服务名:端口
+  Pass: ""
+  DB: 0
+
+# 管理员初始化配置 (仅在首次初始化有效，后续请在数据库管理)
+Administrator:
+  Email: "admin@ppanel.dev"
+  Password: "password"
+
+# 站点配置
+Site:
+  Title: "PPanel"
+  Dec: "PPanel Panel"
+  Url: "https://your-domain.com"
+  SubUrl: "https://sub.your-domain.com"
+
+# 邮件服务配置
+Email:
+  Enable: false
+  # platform: "smtp"
+  # platform_config: "..."
+
+# 验证配置
+Verify:
+  TurnstileSiteKey: ""
+  TurnstileSecret: ""
+  LoginVerify: false
+  RegisterVerify: false
+  ResetPasswordVerify: false
+
+# 注册配置
+Register:
+  StopRegister: false
+  EnableTrial: false
+  TrialSubscribe: 0
+  TrialTime: 0
+  TrialTimeUnit: "hour"
+  EnableIpRegisterLimit: false
+  IpRegisterLimit: 0
+  IpRegisterLimitDuration: 0
+
+# 订阅配置
+Subscribe:
+  SingleModel: false
+  SubscribePath: "/v1/subscribe/config"
+  SubscribeDomain: ""
+  PanDomain: false
+  UserAgentLimit: false
+  UserAgentList: ""