Enhance AI and Redis integration for smoke logging features

- Added AI configuration options to .env.example and config.go for OpenAI integration.
- Implemented Redis caching for session management in main.go and auth middleware.
- Updated smoke logging service to support real smoking time (`smoke_at`) and AI advice retrieval.
- Enhanced API routes to include endpoints for AI advice and unlock functionality for non-members.
- Improved database schema with new tables for AI advice and unlock records.
- Expanded documentation to cover new AI features and Redis caching implementation.

config/config.go

@@ -14,8 +14,11 @@ type Config struct {
 	Database   DatabaseConfig
 	JWT        JWTConfig
 	ShortVideo ShortVideoConfig
+	AI         AIConfig
+	Admin      AdminConfig
 	Qiniu      QiniuConfig
 	WeChatOA   WeChatOfficialConfig
+	Redis      RedisConfig
 }
 
 type ServerConfig struct {
@@ -42,6 +45,19 @@ type ShortVideoConfig struct {
 	RequestTimeout time.Duration
 }
 
+// AIConfig 用于“AI 建议/问答”等能力的通用配置（OpenAI-compatible）。
+type AIConfig struct {
+	BaseURL        string
+	APIKey         string
+	Model          string
+	RequestTimeout time.Duration
+}
+
+// AdminConfig 用于简单的后台/运维接口鉴权（如生成兑换码）。
+type AdminConfig struct {
+	Token string
+}
+
 // QiniuConfig 用于七牛云（Kodo）直传相关配置。
 // 前端通常会向后端请求 upload token，然后直传文件到七牛。
 type QiniuConfig struct {
@@ -61,6 +77,15 @@ type WeChatOfficialConfig struct {
 	RequestTimeout time.Duration
 }
 
+// RedisConfig 用于可选的 Redis 缓存（例如缓存 session_key -> user，减少 DB 查询）。
+type RedisConfig struct {
+	Addr              string
+	Password          string
+	DB                int
+	KeyPrefix         string
+	SessionTTLSeconds int
+}
+
 var AppConfig *Config
 
 func LoadConfig() {
@@ -90,6 +115,15 @@ func LoadConfig() {
 			FreeDailyQuota: getEnvAsInt("SHORT_VIDEO_FREE_QUOTA", 20),
 			RequestTimeout: time.Duration(getEnvAsInt("SHORT_VIDEO_TIMEOUT_SECONDS", 5)) * time.Second,
 		},
+		AI: AIConfig{
+			BaseURL:        getEnv("AI_BASE_URL", "https://api.openai.com/v1"),
+			APIKey:         getEnv("AI_API_KEY", ""),
+			Model:          getEnv("AI_MODEL", "gpt-4o-mini"),
+			RequestTimeout: time.Duration(getEnvAsInt("AI_TIMEOUT_SECONDS", 15)) * time.Second,
+		},
+		Admin: AdminConfig{
+			Token: getEnv("ADMIN_API_TOKEN", ""),
+		},
 		Qiniu: QiniuConfig{
 			AccessKey:          getEnv("QINIU_ACCESS_KEY", ""),
 			SecretKey:          getEnv("QINIU_SECRET_KEY", ""),
@@ -104,6 +138,13 @@ func LoadConfig() {
 			AppSecret:      getEnv("WECHAT_OA_APP_SECRET", ""),
 			RequestTimeout: time.Duration(getEnvAsInt("WECHAT_OA_TIMEOUT_SECONDS", 5)) * time.Second,
 		},
+		Redis: RedisConfig{
+			Addr:              getEnv("REDIS_ADDR", ""),
+			Password:          getEnv("REDIS_PASSWORD", ""),
+			DB:                getEnvAsInt("REDIS_DB", 0),
+			KeyPrefix:         getEnv("REDIS_KEY_PREFIX", "wx_service:"),
+			SessionTTLSeconds: getEnvAsInt("REDIS_SESSION_TTL_SECONDS", 86400),
+		},
 	}
 }