feat(storage): add dynamic storage config and migration

Move storage backend configuration from startup YAML to system_config-backed runtime configuration. Add local, S3-compatible, R2, MinIO, OSS, and WebDAV backend support.

Add a storage migration async task using the existing task dispatch framework. Migration target config is carried in task payload, and maintenance mode is derived from task execution state.

Split upload file management and storage operations, add the admin storage configuration tab, and update migrations and Swagger docs.

internal/config/config.go

@@ -224,16 +224,6 @@ func applyEnvOverrides(c *configModel) {
 	// ─── OTel ───
 	c.Otel.SamplingRate = envFloat64("OTEL_SAMPLING_RATE", c.Otel.SamplingRate)
 
-	// ─── S3 ───
-	c.S3.Endpoint = envStr("S3_ENDPOINT", c.S3.Endpoint)
-	c.S3.Region = envStr("S3_REGION", c.S3.Region)
-	c.S3.Bucket = envStr("S3_BUCKET", c.S3.Bucket)
-	c.S3.AccessKeyID = envStr("S3_ACCESS_KEY_ID", c.S3.AccessKeyID)
-	c.S3.SecretAccessKey = envStr("S3_SECRET_ACCESS_KEY", c.S3.SecretAccessKey)
-	c.S3.CdnURL = envStr("S3_CDN_URL", c.S3.CdnURL)
-	c.S3.PathStyle = envBool("S3_PATH_STYLE", c.S3.PathStyle)
-	c.S3.Enabled = envBool("S3_ENABLED", c.S3.Enabled)
-
 	// ─── Worker ───
 	c.Worker.Concurrency = envInt("WORKER_CONCURRENCY", c.Worker.Concurrency)
 	c.Worker.StrictPriority = envBool("WORKER_STRICT_PRIORITY", c.Worker.StrictPriority)

internal/config/model.go

@@ -15,7 +15,6 @@ type configModel struct {
 	Worker     workerConfig     `mapstructure:"worker"`
 	ClickHouse clickHouseConfig `mapstructure:"clickhouse"`
 	Otel       otelConfig       `mapstructure:"otel"`
-	S3         s3Config         `mapstructure:"s3"`
 }
 
 // appConfig 应用基本配置
@@ -139,22 +138,3 @@ type QueueConfig struct {
 type otelConfig struct {
 	SamplingRate float64 `mapstructure:"sampling_rate"`
 }
-
-// s3Config S3 compatible storage configuration
-type s3Config struct {
-	Enabled         bool             `mapstructure:"enabled"`
-	Endpoint        string           `mapstructure:"endpoint"`
-	Region          string           `mapstructure:"region"`
-	Bucket          string           `mapstructure:"bucket"`
-	AccessKeyID     string           `mapstructure:"access_key_id" json:"-"`
-	SecretAccessKey string           `mapstructure:"secret_access_key" json:"-"`
-	PathStyle       bool             `mapstructure:"path_style"`
-	KeyPrefix       string           `mapstructure:"key_prefix"`
-	CdnURL          string           `mapstructure:"cdn_url"`
-	LocalCache      localCacheConfig `mapstructure:"local_cache"`
-}
-
-type localCacheConfig struct {
-	Enabled  bool   `mapstructure:"enabled"`
-	CacheDir string `mapstructure:"cache_dir"`
-}