feat: add installer script and CI configuration for deployment modes

.github/workflows/ci.yml

@@ -102,6 +102,55 @@ jobs:
             backend/coverage.xml
             frontend/coverage/**
 
+  installer:
+    runs-on: ubuntu-latest
+    needs: [check]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Validate installer shell syntax
+        run: bash -n install.sh
+
+      - name: Installer smoke test (docker mode)
+        run: |
+          ./install.sh \
+            --mode docker \
+            --backend-port 18000 \
+            --frontend-port 13000 \
+            --public-host localhost \
+            --api-url http://localhost:18000 \
+            --token-mode generate
+          curl -fsS http://127.0.0.1:18000/healthz >/dev/null
+          curl -fsS http://127.0.0.1:13000 >/dev/null
+
+      - name: Cleanup docker stack after docker mode
+        if: always()
+        run: |
+          docker compose -f compose.yml --env-file .env down -v --remove-orphans || true
+
+      - name: Installer smoke test (local mode)
+        run: |
+          ./install.sh \
+            --mode local \
+            --backend-port 18001 \
+            --frontend-port 13001 \
+            --public-host localhost \
+            --api-url http://localhost:18001 \
+            --token-mode generate \
+            --db-mode docker \
+            --start-services yes
+          curl -fsS http://127.0.0.1:18001/healthz >/dev/null
+          curl -fsS http://127.0.0.1:13001 >/dev/null
+
+      - name: Cleanup local processes and docker resources
+        if: always()
+        run: |
+          if [ -f .install-logs/backend.pid ]; then kill "$(cat .install-logs/backend.pid)" || true; fi
+          if [ -f .install-logs/frontend.pid ]; then kill "$(cat .install-logs/frontend.pid)" || true; fi
+          docker compose -f compose.yml --env-file .env down -v --remove-orphans || true
+
   e2e:
     runs-on: ubuntu-latest
     needs: [check]