refactor(repo): consolidate openflare-server to root and move subprojects to internal/apps

- Merge all files inside openflare-server to the repository root directory.
- Relocate agent, relay, and flared subprojects from internal/ to internal/apps/.
- Combine docker-compose files and update build context paths to root.
- Update GitHub workflows and Dockerfiles to refer to new directories and package names.
- Rewrite Go package imports across all files.
- Resolve database renew test race condition and clean up docs.

frontend/lib/services/admin/cache.service.ts

@@ -0,0 +1,18 @@
+import {BaseService} from '@/lib/services/core';
+import type {CacheConfig, CacheStatus} from './types';
+
+export class AdminCacheService extends BaseService {
+  protected static readonly basePath = '/api/v1/admin';
+
+  static async getCacheStatus(): Promise<CacheStatus> {
+    return this.get<CacheStatus>('/cache/status');
+  }
+
+  static async updateCacheConfig(config: CacheConfig): Promise<void> {
+    return this.post<void>('/cache/config', config);
+  }
+
+  static async clearCache(): Promise<void> {
+    return this.post<void>('/cache/clear');
+  }
+}