Integrate Qiniu upload service and update configuration

- Added Qiniu configuration options to .env.example and config.go for file uploads.
- Refactored main.go to include new Qiniu service and upload handler.
- Updated route registration to accommodate the new upload handler.
- Enhanced documentation to include references for Qiniu upload functionality.
- Removed legacy authentication handler and services to streamline the codebase.

config/config.go

@@ -14,6 +14,7 @@ type Config struct {
 	Database   DatabaseConfig
 	JWT        JWTConfig
 	ShortVideo ShortVideoConfig
+	Qiniu      QiniuConfig
 }
 
 type ServerConfig struct {
@@ -40,6 +41,18 @@ type ShortVideoConfig struct {
 	RequestTimeout time.Duration
 }
 
+// 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 {
+	AccessKey          string
+	SecretKey          string
+	Bucket             string
+	UploadURL          string
+	CDNDomain          string
+	KeyPrefix          string
+	TokenExpireSeconds int
+}
+
 var AppConfig *Config
 
 func LoadConfig() {
@@ -69,6 +82,15 @@ func LoadConfig() {
 			FreeDailyQuota: getEnvAsInt("SHORT_VIDEO_FREE_QUOTA", 20),
 			RequestTimeout: time.Duration(getEnvAsInt("SHORT_VIDEO_TIMEOUT_SECONDS", 5)) * time.Second,
 		},
+		Qiniu: QiniuConfig{
+			AccessKey:          getEnv("QINIU_ACCESS_KEY", ""),
+			SecretKey:          getEnv("QINIU_SECRET_KEY", ""),
+			Bucket:             getEnv("QINIU_BUCKET", ""),
+			UploadURL:          getEnv("QINIU_UPLOAD_URL", "https://upload.qiniup.com"),
+			CDNDomain:          getEnv("QINIU_CDN_DOMAIN", ""),
+			KeyPrefix:          getEnv("QINIU_KEY_PREFIX", "uploads/"),
+			TokenExpireSeconds: getEnvAsInt("QINIU_TOKEN_EXPIRE_SECONDS", 300),
+		},
 	}
 }