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/README.md

@@ -0,0 +1,50 @@
+# Wavelet Frontend
+
+Modern frontend application for the Wavelet scaffold framework.
+
+[中文](./README_zh.md) | English
+
+## Tech Stack
+
+- **Framework**: [Next.js 16](https://nextjs.org/)
+- **Styling**: [Tailwind CSS 4](https://tailwindcss.com/)
+- **UI Components**: [Radix UI](https://www.radix-ui.com/)
+- **Icons**: [Lucide React](https://lucide.dev/)
+- **Package Manager**: [pnpm](https://pnpm.io/)
+
+## Getting Started
+
+### Prerequisites
+
+- Node.js (Latest LTS recommended)
+- pnpm
+
+### Installation
+
+1. Install dependencies:
+   ```bash
+   pnpm install
+   ```
+
+2. Run the development server:
+   ```bash
+   pnpm dev
+   ```
+
+   Open [http://localhost:3000](http://localhost:3000) (or the port shown in your terminal) with your browser to see the result.
+
+## Project Structure
+
+- `app/`: Next.js App Router pages and layouts
+- `components/`: Reusable UI components
+  - `ui/`: Base UI components (buttons, inputs, etc.)
+  - `common/`: Shared business components
+- `lib/`: Utility functions and service definitions
+- `public/`: Static assets
+
+## Scripts
+
+- `pnpm dev`: Start development server with Turbopack
+- `pnpm build`: Build the application for production
+- `pnpm start`: Start production server
+- `pnpm lint`: Run ESLint