feat(storage): implement Redis distributed lock and cache invalidation broadcasting

- Add Redis distributed lock in Execute of MigrationHandler to prevent concurrent storage migrations.
- Define storage:config_invalidation Redis pub/sub channel to broadcast cache invalidation events.
- Implement background pub/sub listener on all nodes to evict config memory cache concurrently.
- Add integration tests for distributed locking and invalidation propagation using miniredis.

internal/apps/admin/system_config/routers.go

@@ -248,6 +248,7 @@ func UpdateSystemConfig(c *gin.Context) {
 
 	if key == model.ConfigKeyStorageConfig {
 		storage.ResetCache()
+		storage.PublishCacheInvalidation(c.Request.Context())
 	}
 
 	c.JSON(http.StatusOK, util.OKNil())