feat: 移除 Docker 部署，添加 Gitea CI/CD workflows

- 删除 docker-compose.yml、Dockerfile、.dockerignore、docker/ 目录
- 更新 deploy.sh：移除 Docker Compose MySQL 启动，改为 systemd 检查
- 新增 .gitea/workflows/deploy.yml：手动触发、rsync + SSH + PM2 部署
- 新增 .gitea/workflows/ci.yml：PR lint + typecheck + test 自动检查

.gitea/workflows/ci.yml

@@ -0,0 +1,40 @@
+# PR 自动检查：代码风格 + 类型检查 + 测试
+name: CI 检查
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+      - run: npm ci
+      - run: npm run lint
+
+  typecheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+      - run: npm ci
+      - run: npm run typecheck
+
+  test:
+    runs-on: ubuntu-latest
+    needs: [lint, typecheck]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+      - run: npm ci
+      - run: npm run test