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/openflare/dns-account.service.ts

@@ -0,0 +1,27 @@
+import {OpenFlareBaseService} from './base.service';
+import type {DnsAccountItem, DnsAccountMutationPayload} from './types';
+
+export class DnsAccountService extends OpenFlareBaseService {
+  protected static override readonly basePath: string = '/api/v1/d/dns-accounts';
+
+  static async list(): Promise<DnsAccountItem[]> {
+    return this.get<DnsAccountItem[]>('/');
+  }
+
+  static async create(
+    payload: DnsAccountMutationPayload,
+  ): Promise<DnsAccountItem> {
+    return this.post<DnsAccountItem>('/', payload);
+  }
+
+  static async update(
+    id: number,
+    payload: DnsAccountMutationPayload,
+  ): Promise<DnsAccountItem> {
+    return this.post<DnsAccountItem>(`/${id}/update`, payload);
+  }
+
+  static async deleteById(id: number): Promise<void> {
+    return this.post<void>(`/${id}/delete`);
+  }
+}