refactor(backend): optimize database safety, validator performance, and scheduler concurrency

- Fix SQL injection risks in proxy_repo and task_repo
- Atomic acquire_pending with UPDATE ... RETURNING
- Reuse aiohttp ClientSession in ValidatorService
- Replace polling with asyncio.Event in SchedulerService
- Optimize ValidationQueue.drain with asyncio.Condition
- Concurrent plugin crawling with asyncio.gather
- Unify ProxyRaw model import path
- Fix test baseline and remove tracked __pycache__ files

app/plugins/speedx.py

@@ -6,8 +6,9 @@ from app.core.log import logger
 
 
 class SpeedXPlugin(BaseHTTPPlugin):
+    default_config = {"max_pages": 5}
     name = "speedx"
-    display_name = "SpeedX代理源"
+    display_name = "SpeedX代理库"
     description = "从 SpeedX GitHub 仓库获取 SOCKS 代理列表"
 
     def __init__(self):
@@ -47,5 +48,5 @@ class SpeedXPlugin(BaseHTTPPlugin):
                     results.append(ProxyRaw(ip, int(port), protocol))
 
         if results:
-            logger.info(f"{self.display_name} 解析完成，获得 {len(results)} 个潜在代理")
+            logger.info(f"{self.display_name} 解析完成，获取 {len(results)} 个潜在代理")
         return results