ci: run pytest in all workflows — real unit job + Qdrant-backed integration job

- pr.yaml: new pytest job (unit tests only, integration deselected by marker)
- main.yaml / cron.yaml / tag.yaml: replace the build-only 'test' job with a
  real pytest unit job + an integration-test job that starts a Qdrant
  container sharing the job container's network namespace
  (--network container:$(hostname) — bypasses the Gitea runner bug with
  service containers), waits for /healthz, runs 'pytest -m integration',
  then tears down.
- build/build-push jobs now require [test, integration-test]; previously
  'test' was only a docker build and pytest never ran in CI.
- integration-test first cleans up any stale qdrant container (rerun-safe).
- setup-python SHA aligned with docker-build.yaml (v7, python 3.13/3.14).

.gitea/workflows/cron.yaml

@@ -18,11 +18,60 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
-      - uses: docker/setup-buildx-action@f87e5991a6d7451dcb8d9637bfbc97413f497069 # v4
-      - run: docker build -f pkg/Dockerfile -t ci-image:${{ github.sha }} .
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7
+        with:
+          python-version: "3.13"
+      - name: Install dependencies
+        run: pip install -r requirements.txt pytest
+      - name: Run unit tests
+        run: pytest tests/ -v
+        env:
+          # indexer/server read env at import; unit tests need no real backend
+          QDRANT_URL: http://localhost:6333
+          COLLECTION_NAME: test
+
+  integration-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+
+      - name: Cleanup old Qdrant container
+        run: |
+          docker rm -f mcp-maildir-ci-qdrant 2>/dev/null || true
+
+      - name: Start Qdrant
+        run: |
+          docker run -d --name mcp-maildir-ci-qdrant \
+            --network "container:$(hostname)" \
+            docker.io/qdrant/qdrant:latest
+
+      - name: Wait for Qdrant
+        run: |
+          for i in $(seq 1 30); do
+            curl -s http://localhost:6333/healthz \
+              && echo "QDRANT ready" && break
+            echo "Waiting for Qdrant... ($i/30)"
+            sleep 1
+          done
+          curl -s http://localhost:6333/healthz > /dev/null
+
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7
+        with:
+          python-version: "3.13"
+      - name: Install dependencies
+        run: pip install -r requirements.txt pytest
+      - name: Run integration tests
+        run: pytest tests/ -v -m integration
+        env:
+          QDRANT_URL: http://localhost:6333
+          COLLECTION_NAME: test_mcp_maildir
+
+      - name: Cleanup Qdrant
+        if: always()
+        run: docker rm -f mcp-maildir-ci-qdrant || true
 
   build-push:
-    needs: [test]
+    needs: [test, integration-test]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7