feat: add GitHub Actions workflow for automatic Cloudflare Worker deployment

.github/workflows/deploy-workers.yml

@@ -0,0 +1,44 @@
+name: Deploy Cloudflare Worker
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+concurrency:
+  group: deploy-cloudflare-worker
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v7
+        with:
+          submodules: recursive
+
+      - name: Set up Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version-file: package.json
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile --ignore-scripts
+
+      - name: Build frontend
+        run: bun run build:frontend
+
+      - name: Deploy Worker
+        uses: cloudflare/wrangler-action@v4
+        with:
+          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+          command: deploy
+          packageManager: bun
+          workingDirectory: backend