fix(ci): use /tmp/ci-venv-* to avoid host .venv conflict

.gitea/workflows/ci.yml

@@ -29,12 +29,12 @@ jobs:
 
       - name: Setup Python
         run: |
-          python3 -m venv .venv
-          .venv/bin/pip install --quiet flake8
+          python3 -m venv /tmp/ci-venv-lint
+          /tmp/ci-venv-lint/bin/pip install --quiet flake8
 
       - name: Lint with flake8
         run: |
-          .venv/bin/flake8 src/ --max-line-length=120 --extend-ignore=E501
+          /tmp/ci-venv-lint/bin/flake8 src/ --max-line-length=120 --extend-ignore=E501
 
   # ── Job 2: Test ──────────────────────────────────────
   test:
@@ -45,12 +45,12 @@ jobs:
 
       - name: Setup Python
         run: |
-          python3 -m venv .venv
-          .venv/bin/pip install --quiet -r requirements.txt
+          python3 -m venv /tmp/ci-venv-test
+          /tmp/ci-venv-test/bin/pip install --quiet -r requirements.txt
 
       - name: Run tests (exclude E2E)
         run: |
-          .venv/bin/pytest tests/ -m "not e2e" -x -q
+          /tmp/ci-venv-test/bin/pytest tests/ -m "not e2e" -x -q
 
   # ── Job 3: CI 失败通知 ───────────────────────────────
   # v1.23 不支持 failure()，用 always() + shell 检查 commit status 替代