feat: SOCKS5代理支持、落地IP国家查询、设置页优化

- 代理支持SOCKS5和HTTP两种类型切换
- 落地IP查询显示国家、城市、ISP信息
- 设置页面不再隐藏已配置的值
- Airwallex API异常统一返回400+详细错误信息

backend/app/proxy_client.py

@@ -1,10 +1,14 @@
-"""Airwallex client with proxy support."""
+"""Airwallex client with proxy support (HTTP and SOCKS5)."""
+import logging
 import httpx
+from datetime import datetime, timezone, timedelta
 from airwallex.client import AirwallexClient
 
+logger = logging.getLogger(__name__)
+
 
 class ProxiedAirwallexClient(AirwallexClient):
-    """AirwallexClient that routes requests through an HTTP proxy."""
+    """AirwallexClient that routes requests through an HTTP or SOCKS5 proxy."""
 
     def __init__(self, proxy_url: str | None = None, **kwargs):
         self._proxy_url = proxy_url
@@ -17,16 +21,20 @@ class ProxiedAirwallexClient(AirwallexClient):
                 timeout=self.request_timeout,
                 proxy=proxy_url,
             )
+            safe_url = proxy_url.split("@")[-1] if "@" in proxy_url else proxy_url
+            logger.info("Airwallex client initialized with proxy: %s", safe_url)
+        else:
+            logger.info("Airwallex client initialized without proxy")
 
     def authenticate(self) -> None:
         """Override authenticate to use proxy for auth requests too."""
-        from datetime import datetime, timezone
-
         if self._token and self._token_expiry and datetime.now(timezone.utc) < self._token_expiry:
             return
 
-        # Use a proxied client for authentication
-        auth_kwargs = {"timeout": self.request_timeout}
+        logger.info("Authenticating with Airwallex API at %s (proxy: %s)",
+                     self.auth_url, bool(self._proxy_url))
+
+        auth_kwargs: dict = {"timeout": self.request_timeout}
         if self._proxy_url:
             auth_kwargs["proxy"] = self._proxy_url
 
@@ -41,11 +49,15 @@ class ProxiedAirwallexClient(AirwallexClient):
                 },
                 content="{}",
             )
-            response.raise_for_status()
+
+            if response.status_code != 200:
+                body = response.text[:300]
+                logger.error("Auth failed: HTTP %d, body: %s", response.status_code, body)
+                response.raise_for_status()
+
             data = response.json()
             self._token = data.get("token")
-            # Token valid for 30 minutes, refresh a bit early
-            from datetime import timedelta
             self._token_expiry = datetime.now(timezone.utc) + timedelta(minutes=28)
+            logger.info("Authentication successful, token expires in 28 minutes")
         finally:
             auth_client.close()