refactor(db): use version string as primary key for ConfigVersion

-transition `of_config_versions` primary key from `id` to `version` string.
-add database migration files `202606270001_make_version_primary_key.sql` for PostgreSQL and SQLite.
-introduce AfterFind/AfterCreate GORM hooks to preserve JSON backward compatibility.
-refactor API controllers, logics, and front-end typescript definitions to receive `string` parameter.

frontend/lib/services/openflare/config-version.service.ts

@@ -29,7 +29,7 @@ export class ConfigVersionService extends OpenFlareBaseService {
     return this.get<ConfigDiffResult>('/diff');
   }
 
-  static getById(id: number): Promise<ConfigVersionDetail> {
+  static getById(id: string): Promise<ConfigVersionDetail> {
     return this.get<ConfigVersionDetail>(`/${id}`);
   }
 
@@ -43,7 +43,7 @@ export class ConfigVersionService extends OpenFlareBaseService {
     );
   }
 
-  static activate(id: number): Promise<ConfigVersionDetail> {
+  static activate(id: string): Promise<ConfigVersionDetail> {
     return this.post<ConfigVersionDetail>(`/${id}/activate`);
   }
 

frontend/lib/services/openflare/types.ts

@@ -307,7 +307,7 @@ export interface ProxyRouteMutationPayload {
 }
 
 export interface ConfigVersionSummary {
-  id: number;
+  id: string;
   version: string;
   checksum: string;
   is_active: boolean;