fix: 修复设置系统脱节、队列计数漂移、资源泄露等全量问题

- 统一设置系统：create_scheduler_service 读取 DB 设置覆盖默认值
- 修复 ProxyRepository.update_score 误删所有无效代理的 SQL
- ValidationQueue：修复 Worker 计数漂移与启动恢复任务饿死
- SchedulerService：移除 drain() 阻塞，主循环可正常响应 stop
- TaskService：在调度器周期内自动清理过期任务，防止内存泄漏
- lifespan/conftest：规范关闭顺序，消除 Event loop closed 警告
- Repository：异常日志增加 exc_info，今日新增按 created_at 统计
- ValidatorService：防止 HTTP session 重复关闭，移除 SOCKS 多余 close
- 前端：补全 pluginsStore.isEmpty，ProxyList 最低分数上限改为 100
- 删除 config.py 中冗余的 cors_origins_list property

tests/conftest.py

@@ -1,4 +1,5 @@
 """pytest 配置文件和 fixtures"""
+import asyncio
 import pytest
 import pytest_asyncio
 from typing import AsyncGenerator
@@ -7,16 +8,30 @@ from httpx import AsyncClient, ASGITransport
 from app.api import create_app
 from app.core.db import init_db, get_db
 from app.repositories.proxy_repo import ProxyRepository
+from app.models.domain import ProxyRaw
 
 
 @pytest_asyncio.fixture(scope="function")
 async def app():
     """创建应用实例"""
-    # 初始化测试数据库
+    # 初始化测试数据库并清空历史数据，避免任务残留或设置状态导致 drain() 卡住
     await init_db()
-    app = create_app()
-    async with app.router.lifespan_context(app):
-        yield app
+    async with get_db() as db:
+        await db.execute("DELETE FROM validation_tasks")
+        await db.execute("DELETE FROM proxies")
+        await db.execute("DELETE FROM settings")
+        await db.commit()
+    
+    # 清理全局内存状态，防止跨测试污染
+    from app.services.task_service import task_service
+    task_service._tasks.clear()
+    
+    test_app = create_app()
+    async with test_app.router.lifespan_context(test_app):
+        yield test_app
+    
+    # 给 aiosqlite / aiohttp 后台线程留出收尾时间，降低 Event loop closed 警告概率
+    await asyncio.sleep(0.1)
 
 
 @pytest_asyncio.fixture
@@ -47,3 +62,27 @@ async def sample_proxy(db, proxy_repo):
     yield {"ip": "192.168.1.1", "port": 8080, "protocol": "http", "score": 50}
     # 清理
     await proxy_repo.delete(db, "192.168.1.1", 8080)
+
+
+@pytest_asyncio.fixture(autouse=True)
+async def mock_external_requests(monkeypatch):
+    """
+    自动在所有测试中 mock 外部网络请求：
+    1. 插件爬取返回固定测试代理，避免真实 HTTP 请求
+    2. 代理验证瞬间成功，避免连接超时等待
+    """
+    from app.services.plugin_service import PluginService
+    from app.services.validator_service import ValidatorService
+
+    async def _mock_run_plugin(self, plugin_id: str):
+        return [ProxyRaw("192.168.100.10", 8080, "http")]
+
+    async def _mock_run_all_plugins(self):
+        return [ProxyRaw("192.168.100.10", 8080, "http")]
+
+    async def _mock_validate(self, ip: str, port: int, protocol: str = "http"):
+        return True, 1.23
+
+    monkeypatch.setattr(PluginService, "run_plugin", _mock_run_plugin)
+    monkeypatch.setattr(PluginService, "run_all_plugins", _mock_run_all_plugins)
+    monkeypatch.setattr(ValidatorService, "validate", _mock_validate)