fix CI: move Python deps + reranker test to systemd ExecStartPre

Runner container lacks Python 3.11, so pip install and self-test
now run as ExecStartPre in zhixi-worker.service on the host.

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

.gitea/workflows/deploy.yml

@@ -93,31 +93,16 @@ jobs:
           rsync -av --delete --exclude='.env' --exclude='__pycache__' \
             /tmp/api-server/rag-worker/ "$WORKER_DIR/"
 
-          # Install any new Python dependencies
-          /usr/bin/python3.11 -m pip install -r "$WORKER_DIR/requirements.txt" \
-            -i https://mirrors.tencentyun.com/pypi/simple 2>&1 | tail -3
-
-          # Reload systemd and restart worker
+          # Copy service file and reload
+          cp "$WORKER_DIR/zhixi-worker.service" /etc/systemd/system/
           systemctl daemon-reload
           systemctl restart zhixi-worker
-          sleep 3
-          systemctl is-active zhixi-worker && echo "[deploy] zhixi-worker restarted OK"
-
-          # Test reranker
-          cd "$WORKER_DIR"
-          /usr/bin/python3.11 -c "
-          import asyncio
-          from reranker import rerank
-          async def t():
-              r = await rerank('什么是主动回忆', [
-                  '主动回忆是一种高效的学习策略，通过主动从记忆中提取信息来强化神经连接',
-                  '苹果是一种常见的水果，富含维生素C',
-                  '间隔重复和主动回忆结合使用效果更佳',
-              ], top_n=2)
-              for x in r:
-                  print(f'[rerank-test] score={x[\"score\"]:.4f} text={x[\"text\"][:40]}')
-          asyncio.run(t())
-          " && echo "[deploy] Reranker test OK"
+          sleep 8
+          systemctl is-active zhixi-worker && echo "[deploy] zhixi-worker active OK" || {
+            echo "[deploy] zhixi-worker FAILED, checking logs:"
+            journalctl -u zhixi-worker --no-pager -n 30
+            exit 1
+          }
 
       - name: Health check
         run: |

rag-worker/zhixi-worker.service

@@ -0,0 +1,30 @@
+[Unit]
+Description=ZhiXi RAG Worker
+After=network.target
+
+[Service]
+Type=simple
+User=root
+WorkingDirectory=/opt/zhixi/backend/rag-worker
+Environment="PYTHONUNBUFFERED=1"
+EnvironmentFile=/opt/zhixi/backend/rag-worker/.env
+
+# Install deps and self-test before starting main loop
+ExecStartPre=/usr/bin/python3.11 -m pip install -q -r /opt/zhixi/backend/rag-worker/requirements.txt -i https://mirrors.tencentyun.com/pypi/simple
+ExecStartPre=/usr/bin/python3.11 -c "
+import asyncio, sys
+from reranker import rerank
+async def t():
+    r = await rerank('测试', ['这是测试文本', '无关内容'], top_n=1)
+    if not r: raise RuntimeError('reranker returned empty')
+    print(f'[self-test] reranker OK, score={r[0][\"score\"]:.4f}')
+asyncio.run(t())
+print('[self-test] all checks passed')
+"
+
+ExecStart=/usr/bin/python3.11 -u main.py
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target