ci: split unit and integration tests into separate steps

2893 tests with DB fixture setup take 2.5h+ on 2-core ARM runner.
Split into unit tests (2484, fast) and integration tests (341, DB-heavy)
as separate steps for better visibility into what's slow.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -74,8 +74,11 @@ jobs:
       - name: Install dependencies
         run: uv pip install --system -r requirements.txt -r requirements-test.txt
 
-      - name: Run tests
+      - name: Run unit tests
-        run: python -m pytest -v --tb=short --timeout=120 --no-cov --override-ini="addopts=" -p no:cacheprovider --durations=20
+        run: python -m pytest -m "unit" -v --tb=short --timeout=120 --no-cov --override-ini="addopts=" -p no:cacheprovider --durations=20
+
+      - name: Run integration tests
+        run: python -m pytest -m "integration" -v --tb=short --timeout=120 --no-cov --override-ini="addopts=" -p no:cacheprovider --durations=20
 
   validate:
     runs-on: ubuntu-latest