feat: fpw plugins, validation/crawl perf, WS stats, test DB isolation

- Add Free_Proxy_Website-style fpw_* plugins and register them
- Per-plugin crawl timeout (crawl_timeout_seconds=120); remove global crawl_timeout setting
- Validator: fix connect vs total timeout on save; SOCKS session LRU cache; drop redundant semaphore
- Validation handler uses single DB connection; batch upsert after crawl; WorkerPool put_nowait
- Remove unused max_retries from settings API/UI; settings maintenance SQL + init_db cleanup of deprecated keys
- WebSocket dashboard stats; ProxyList pool_filter and API alignment
- POST /api/proxies/delete-one for IPv6-safe deletes; task poll stops on 404
- pytest uses PROXYPOOL_DB_PATH=db/proxies.test.sqlite so tests do not wipe production DB
- .gitignore: explicit proxies.test.sqlite patterns; fix plugin_service ValidationException import

Made-with: Cursor

tests/integration/test_proxies_api.py

@@ -14,6 +14,7 @@ class TestProxiesAPI:
         assert data["code"] == 200
         assert "data" in data
         assert "total" in data["data"]
+        assert "pending" in data["data"]
         assert "available" in data["data"]
         assert "scheduler_running" in data["data"]
 
@@ -68,6 +69,17 @@ class TestProxiesAPI:
         # 可能返回 200(有数据) 或 404(无数据)
         assert response.status_code in [200, 404]
 
+    @pytest.mark.asyncio
+    async def test_delete_proxy_post_json(self, client, sample_proxy):
+        """测试 POST /api/proxies/delete-one（前端默认路径，兼容 IPv6）"""
+        response = await client.post(
+            "/api/proxies/delete-one",
+            json={"ip": sample_proxy["ip"], "port": sample_proxy["port"]},
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert data["code"] == 200
+
     @pytest.mark.asyncio
     async def test_delete_proxy(self, client, sample_proxy):
         """测试 DELETE /api/proxies/{ip}/{port}"""
@@ -76,6 +88,19 @@ class TestProxiesAPI:
         data = response.json()
         assert data["code"] == 200
 
+    @pytest.mark.asyncio
+    async def test_delete_one_ipv6(self, client, db, proxy_repo):
+        """POST delete-one 可删除含冒号的 IP（路径 DELETE 无法可靠表达）"""
+        await proxy_repo.insert_or_update(db, "2001:db8::1", 18080, "http", 40)
+        r = await client.post(
+            "/api/proxies/delete-one",
+            json={"ip": "2001:db8::1", "port": 18080},
+        )
+        assert r.status_code == 200
+        assert r.json()["code"] == 200
+        left = await proxy_repo.get_by_ip_port(db, "2001:db8::1", 18080)
+        assert left is None
+
     @pytest.mark.asyncio
     async def test_delete_nonexistent_proxy(self, client):
         """测试 DELETE /api/proxies/{ip}/{port} - 不存在的代理"""