feat: consolidate auto-issue into ci.yml with if: failure()

- Replace workflow_run with same-workflow conditional job
- Add create_failure_issue.py script for Gitea API integration
- More reliable than cross-workflow triggers

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -17,3 +17,20 @@ jobs:
 
       - name: Run tests
         run: python -m pytest tests/ -v
+
+  create-issue-on-failure:
+    runs-on: shell
+    needs: test
+    if: failure()
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Create failure issue
+        shell: bash
+        run: |
+          python scripts/create_failure_issue.py \
+            --sha "${{ github.sha }}" \
+            --branch "${{ github.ref_name }}" \
+            --run "${{ github.run_number }}" \
+            --message "${{ github.event.head_commit.message }}" \
+            --api-token "${{ secrets.GITEA_TOKEN }}"