ci: increase pytest timeout to 150min for CAX11 runner

2,484 unit tests take ~13min locally but ~2h on the 2-vCPU CAX11.
pytest-xdist doesn't work with the shared DB session setup, so
increase the job timeout instead. Runner config also bumped to 3h.

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: 60
+    timeout-minutes: 150
     services:
       postgres:
         image: postgres:15