fix: Improve database initialization and connection handling

- Added logic to close the database connection after migrations to ensure a clean state.
- Implemented reconnection to the database post-migrations to prevent potential issues.
- Updated rclone connection logic to use 'host' instead of 'endpoint' for webdav and nextcloud providers, enhancing consistency in configuration arguments.

internal/rclone_service/rclone_service.go

@@ -210,12 +210,12 @@ func TestRcloneConnection(config db.TransferConfig, providerType string, dbInsta
 			createArgs = append(createArgs, "domain", domain)
 		}
 	case "webdav":
-		createArgs = append(createArgs, "url", endpoint, "vendor", "other", "user", user)
+		createArgs = append(createArgs, "url", host, "vendor", "other", "user", user)
 		if pass != "" {
 			createArgs = append(createArgs, "pass", pass)
 		}
 	case "nextcloud":
-		createArgs = append(createArgs, "url", endpoint, "vendor", "nextcloud", "user", user)
+		createArgs = append(createArgs, "url", host, "vendor", "nextcloud", "user", user)
 		if pass != "" {
 			createArgs = append(createArgs, "pass", pass)
 		}