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

app/core/db.py

@@ -54,10 +54,23 @@ async def init_db():
             await db.execute("UPDATE proxies SET created_at = CURRENT_TIMESTAMP WHERE created_at IS NULL")
             logger.info("Migrated: added created_at column")
 
+        # 迁移：validated 0=待验证 1=已验证入池（参与分数维护）
+        try:
+            await db.execute("SELECT validated FROM proxies LIMIT 1")
+        except Exception:
+            await db.execute(
+                "ALTER TABLE proxies ADD COLUMN validated INTEGER NOT NULL DEFAULT 0"
+            )
+            await db.execute(
+                "UPDATE proxies SET validated = 1 WHERE score > 0"
+            )
+            logger.info("Migrated: added validated column")
+
         await db.execute("CREATE INDEX IF NOT EXISTS idx_score ON proxies(score)")
         await db.execute("CREATE INDEX IF NOT EXISTS idx_protocol ON proxies(protocol)")
         await db.execute("CREATE INDEX IF NOT EXISTS idx_last_check ON proxies(last_check)")
         await db.execute("CREATE INDEX IF NOT EXISTS idx_ip_port ON proxies(ip, port)")
+        await db.execute("CREATE INDEX IF NOT EXISTS idx_validated ON proxies(validated)")
 
         # 插件设置表
         await db.execute("""
@@ -94,6 +107,10 @@ async def init_db():
                 updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
             )
         """)
+        # 仅移除已废弃设置键，不碰 proxies 表数据
+        await db.execute(
+            "DELETE FROM settings WHERE key IN ('crawl_timeout', 'max_retries')"
+        )
 
         await db.commit()
     logger.info("Database initialized")
@@ -112,6 +129,19 @@ async def get_db() -> AsyncIterator[aiosqlite.Connection]:
         await db.close()
 
 
+@asynccontextmanager
+async def get_db_connection() -> AsyncIterator[aiosqlite.Connection]:
+    """单连接贯穿「读库 → await 网络 I/O → 写库」，减少验证 worker 每条代理两次 connect。"""
+    ensure_db_dir()
+    db = await aiosqlite.connect(DB_PATH)
+    try:
+        await db.execute("PRAGMA journal_mode=WAL")
+        await db.execute("PRAGMA synchronous=NORMAL")
+        yield db
+    finally:
+        await db.close()
+
+
 @asynccontextmanager
 async def transaction() -> AsyncIterator[aiosqlite.Connection]:
     """获取带有显式事务控制的数据库连接