chore: 合并为单仓库，统一部署流程

- 根目录加入 docker-compose、Caddyfile、文档等原本不在仓库里的文件
- 前后端两份 GitHub Actions 合并成根目录的一个 deploy workflow：
  构建前端上传到 build/，再在服务器上 git pull 并重建容器

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

AGENTS.md

@@ -0,0 +1,34 @@
+# Repository Guidelines
+
+## Project Structure & Module Organization
+
+WebPreview is a Django API plus Vue 3 client.
+
+- `api/` contains the Django project. `api/api/` holds settings and URLs; feature apps live in `account/`, `task/`, `submission/`, `prompt/`, and `utils/`.
+- `client/` contains the Vue 3 + TypeScript SPA. Route views are in `client/src/pages/`, shared UI in `client/src/components/`, state in `client/src/store/`, and helpers/types in `client/src/utils/`.
+- `client/public/` stores browser assets. `build/`, `data/`, `media/`, and `redis/` are generated or runtime directories.
+- `docs/` stores design and implementation plans.
+
+## Build and Development Commands
+
+- `./dev.sh`: starts the Django API and Rsbuild frontend together for local development.
+- `cd api && uv run manage.py runserver`: run only the backend.
+- `cd api && uv run manage.py migrate`: apply Django migrations.
+- `cd client && npm run start`: start the frontend dev server.
+- `cd client && npm run build`: create the production client build in `build/`.
+- `cd client && npm run fmt`: format frontend source with Prettier.
+- `docker compose up -d --build`: rebuild and start the Docker stack.
+
+## Coding Style & Naming Conventions
+
+Use 4-space indentation for Python and follow Django app conventions: models in `models.py`, handlers in `api.py` or router files, schemas in `schemas.py`, and migrations in `migrations/`. Use `snake_case` for functions and variables.
+
+Frontend code uses Vue single-file components, TypeScript strict mode, and Prettier. Name components/pages in `PascalCase.vue`, and keep store modules domain-based, such as `submission.ts`.
+
+## Commit & Pull Request Guidelines
+
+This checkout lacks readable Git history, so use concise imperative commit messages such as `Add showcase management view`. Pull requests should describe the behavior change, list build/manual verification steps, link issues or plans, and include screenshots for visible UI changes.
+
+## Security & Configuration Tips
+
+Keep secrets in `.env` and do not commit credentials or generated runtime data. The API uses environment-driven settings for database, Redis, and LLM provider configuration.