feat(ci): add backend compilation step to CI workflow and introduce compile task for Python syntax checking

.gitea/workflows/ci.yml

@@ -59,3 +59,19 @@ jobs:
               run: task build-frontend
               env:
                   VITE_APP_VERSION: ${{ steps.version.outputs.version }}
+
+    test-backend:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: https://git.quad4.io/actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+            - name: Setup Python
+              uses: https://git.quad4.io/actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548 # v6.1.0
+              with:
+                  python-version: "3.13"
+            - name: Setup Task
+              uses: https://git.quad4.io/actions/setup-task@0ab1b2a65bc55236a3bc64cde78f80e20e8885c2 # v1
+              with:
+                  version: "3.46.3"
+            - name: Compile backend
+              run: task compile