ci(deploy): fix SSH command quoting (newlines instead of && chaining)

CI only builds/tests. Deploy is a separate workflow triggered via
workflow_run after CI passes: pull → bun install → web build → restart
all 4 systemd services (web/api/mcp/worker) over SSH.

Secrets (stored in GitHub):
- SSH_DEPLOY_HOST=100.79.111.61
- SSH_DEPLOY_PORT=22
- SSH_DEPLOY_USER=code

- SSH_DEPLOY_KEY=<ed25519 deploy key added to VPS authorized_keys>

.github/workflows/deploy.yml

@@ -0,0 +1,55 @@
+name: Deploy
+
+on:
+  workflow_run:
+    workflows: ["CI"]
+    types: [completed]
+    branches: [main]
+
+concurrency:
+  group: deploy-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    name: build + deploy
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: "1.3.14"
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Typecheck
+        run: bun run typecheck
+
+      - name: Build web app
+        run: bun --cwd apps/web run build
+
+      - name: Deploy to VPS over SSH
+        env:
+          SSH_DEPLOY_HOST: ${{ secrets.SSH_DEPLOY_HOST }}
+          SSH_DEPLOY_PORT: ${{ secrets.SSH_DEPLOY_PORT }}
+          SSH_DEPLOY_USER: ${{ secrets.SSH_DEPLOY_USER }}
+          SSH_DEPLOY_KEY: ${{ secrets.SSH_DEPLOY_KEY }}
+        run: |
+          mkdir -p ~/.ssh
+          echo "$SSH_DEPLOY_KEY" > ~/.ssh/deploy_key
+          chmod 600 ~/.ssh/deploy_key
+          ssh-keyscan -p "$SSH_DEPLOY_PORT" "$SSH_DEPLOY_HOST" >> ~/.ssh/known_hosts 2>/dev/null || true
+          ssh -i ~/.ssh/deploy_key -p "$SSH_DEPLOY_PORT" "$SSH_DEPLOY_USER@$SSH_DEPLOY_HOST" \
+            'set -e
+             cd /home/code/mcpedia
+             git pull origin main
+             /home/code/.bun/bin/bun install --frozen-lockfile
+             /home/code/.bun/bin/bun --cwd apps/web run build
+             sudo systemctl restart mcpedia-web mcpedia-api mcpedia-mcp mcpedia-worker
+             sleep 3
+             systemctl --no-pager status mcpedia-web mcpedia-api mcpedia-mcp mcpedia-worker --no-legend'