perf: 并行化后端单测并拆分覆盖率任务 (#6369)

.github/workflows/test.yml

@@ -21,8 +21,16 @@ concurrency:
 jobs:
   pytest:
     runs-on: ubuntu-latest
-    name: Unit Tests
+    name: Unit Tests (${{ matrix.shard }})
     timeout-minutes: 20
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - shard: '1/4'
+          - shard: '2/4'
+          - shard: '3/4'
+          - shard: '4/4'
 
     steps:
       - name: Checkout code
@@ -42,18 +50,42 @@ jobs:
         run: uv sync --locked
 
       - name: Run tests
+        timeout-minutes: 10
+        run: uv run --locked --no-sync python tests/run.py --shard "${{ matrix.shard }}"
+
+  coverage:
+    if: github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    name: Coverage Report
+    timeout-minutes: 20
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Set up uv
+        uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
+        with:
+          version: '0.12.5'
+          python-version: '3.12'
+          enable-cache: true
+          cache-dependency-glob: |
+            pyproject.toml
+            uv.lock
+
+      - name: Install dependencies
+        run: uv sync --locked
+
+      - name: Generate coverage reports
         timeout-minutes: 10
         run: |
-          # tests/run.py 以 pytest 跑 tests 全量；tests/conftest.py 在收集前把 CONFIG_DIR
-          # 指向临时库并建表；CI 额外生成覆盖率报告，便于后续补测和回归分析。
           uv run --locked --no-sync python -m coverage erase
-          uv run --locked --no-sync python -m coverage run tests/run.py
+          uv run --locked --no-sync python -m coverage run tests/run.py --serial
           uv run --locked --no-sync python -m coverage report
           uv run --locked --no-sync python -m coverage json
           uv run --locked --no-sync python -m coverage xml
 
       - name: Upload coverage report
-        if: always()
         uses: actions/upload-artifact@v6
         with:
           name: coverage-report