feat(ci): add per-package diagnostic step to platform-build job

Adds a continue-on-error step that runs ./internal/handlers/... and
./internal/pendinguploads/... with -v -timeout 60s, tee-ing output to
/tmp/ and emitting last-100-lines to step summary.  Gitea Actions logs
API returns 404 (gitea/gitea#22168), making the run-page step summary
the only available signal when CI stalls.  Step is stripped before merge.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -148,6 +148,21 @@ jobs:
       - if: needs.changes.outputs.platform == 'true'
         name: Run golangci-lint
         run: golangci-lint run --timeout 3m ./... || true
+      - if: needs.changes.outputs.platform == 'true'
+        name: Diagnostic — per-package verbose 60s
+        run: |
+          set +e
+          go test -race -v -timeout 60s ./internal/handlers/... 2>&1 | tee /tmp/test-handlers.log
+          handlers_exit=$?
+          go test -race -v -timeout 60s ./internal/pendinguploads/... 2>&1 | tee /tmp/test-pu.log
+          pu_exit=$?
+          echo "::group::handlers exit=$handlers_exit (last 100 lines)"
+          tail -100 /tmp/test-handlers.log
+          echo "::endgroup::"
+          echo "::group::pendinguploads exit=$pu_exit (last 100 lines)"
+          tail -100 /tmp/test-pu.log
+          echo "::endgroup::"
+        continue-on-error: true
       - if: needs.changes.outputs.platform == 'true'
         name: Run tests with race detection and coverage
         run: go test -race -coverprofile=coverage.out ./...