ci: disable coverage in CI and increase timeout to 90min

Coverage instrumentation (--cov) in pyproject.toml addopts was adding
3-5x overhead on the 2-core ARM CI runner. Disable it in CI with
--no-cov and --override-ini to clear addopts. Add --durations=20 to
identify slowest tests.

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

.gitea/workflows/ci.yml

@@ -41,7 +41,7 @@ jobs:
   # ---------------------------------------------------------------------------
   pytest:
     runs-on: ubuntu-latest
-    timeout-minutes: 45
+    timeout-minutes: 90
     services:
       postgres:
         image: postgres:15
@@ -75,7 +75,7 @@ jobs:
         run: uv pip install --system -r requirements.txt -r requirements-test.txt
 
       - name: Run tests
-        run: python -m pytest -v --tb=short --timeout=120
+        run: python -m pytest -v --tb=short --timeout=120 --no-cov --override-ini="addopts=" -p no:cacheprovider --durations=20
 
   validate:
     runs-on: ubuntu-latest