fix: add pip timeout, retries, and mirror fallback to all CI workflows

- Wrap pip install in timeout 300 to prevent hanging on slow mirrors
- Add --retries 3 --timeout 30 to pip for better resilience
- Fallback chain: default index → Tsinghua mirror → default index
- Applied to test.yml, deploy.yml, and deploy-dev.yml

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

.gitea/workflows/test.yml

@@ -74,27 +74,35 @@ jobs:
           cd dashboard/backend
           if [ "${{ steps.cache-python.outputs.cache-hit }}" = "true" ]; then
             echo "Restoring venv from cache $CACHE_KEY..."
-            if cp -a $CACHE_DIR/venv . && [ -f venv/bin/activate ]; then
+	    if cp -a $CACHE_DIR/venv . && [ -f venv/bin/activate ]; then
               echo "Cache restored successfully"
-            else
-              echo "Cache corrupted, installing fresh..."
+	    else
+	      echo "Cache corrupted, installing fresh..."
               rm -rf venv
               python3 -m venv venv
               . venv/bin/activate
-              pip install --cache-dir=$PIP_CACHE_DIR -r requirements.txt || pip install -r requirements.txt
-              pip install --cache-dir=$PIP_CACHE_DIR -r requirements-dev.txt || pip install -r requirements-dev.txt
-              pip install --cache-dir=$PIP_CACHE_DIR pytest-timeout pytest-cov || pip install pytest-timeout pytest-cov
-            fi
-          else
+              timeout 300 pip install --cache-dir=$PIP_CACHE_DIR --retries 3 --timeout 30 -r requirements.txt || \
+                timeout 300 pip install --cache-dir=$PIP_CACHE_DIR --index-url https://pypi.tuna.tsinghua.edu.cn/simple --trusted-host pypi.tuna.tsinghua.edu.cn -r requirements.txt || \
+                pip install -r requirements.txt
+	      timeout 300 pip install --cache-dir=$PIP_CACHE_DIR --retries 3 --timeout 30 -r requirements-dev.txt || \
+                timeout 300 pip install --cache-dir=$PIP_CACHE_DIR --index-url https://pypi.tuna.tsinghua.edu.cn/simple --trusted-host pypi.tuna.tsinghua.edu.cn -r requirements-dev.txt || \
+                pip install -r requirements-dev.txt
+	      timeout 300 pip install --cache-dir=$PIP_CACHE_DIR pytest-timeout pytest-cov || pip install pytest-timeout pytest-cov
+	    fi
+	  else
             echo "Installing fresh dependencies..."
             python3 -m venv venv
             . venv/bin/activate
-            pip install --cache-dir=$PIP_CACHE_DIR -r requirements.txt || pip install -r requirements.txt
-            pip install --cache-dir=$PIP_CACHE_DIR -r requirements-dev.txt || pip install -r requirements-dev.txt
-            pip install --cache-dir=$PIP_CACHE_DIR pytest-timeout pytest-cov || pip install pytest-timeout pytest-cov
+            timeout 300 pip install --cache-dir=$PIP_CACHE_DIR --retries 3 --timeout 30 -r requirements.txt || \
+              timeout 300 pip install --cache-dir=$PIP_CACHE_DIR --index-url https://pypi.tuna.tsinghua.edu.cn/simple --trusted-host pypi.tuna.tsinghua.edu.cn -r requirements.txt || \
+              pip install -r requirements.txt
+            timeout 300 pip install --cache-dir=$PIP_CACHE_DIR --retries 3 --timeout 30 -r requirements-dev.txt || \
+              timeout 300 pip install --cache-dir=$PIP_CACHE_DIR --index-url https://pypi.tuna.tsinghua.edu.cn/simple --trusted-host pypi.tuna.tsinghua.edu.cn -r requirements-dev.txt || \
+              pip install -r requirements-dev.txt
+            timeout 300 pip install --cache-dir=$PIP_CACHE_DIR pytest-timeout pytest-cov || pip install pytest-timeout pytest-cov
             echo "Saving venv to cache $CACHE_KEY..."
-            cp -a venv $CACHE_DIR/ || echo "Warning: cache save failed"
-          fi
+	    cp -a venv $CACHE_DIR/ || echo "Warning: cache save failed"
+	  fi
 
       - name: Run tests with coverage
         run: |