fix: add proxy disconnection retry for network error handling

Add 'Proxy connection' to retryable error patterns in both
core.ts and smart-poller.ts to handle proxy disconnection errors
like "Proxy connection ended before receiving CONNECT response".

Closes #118

Author: root

src/api/controllers/core.ts

@@ -396,7 +396,8 @@ export async function request(
         error.message.includes('timeout') ||
         error.message.includes('network') ||
         error.message.includes('ECONNRESET') ||
-        error.message.includes('socket hang up');
+        error.message.includes('socket hang up') ||
+        error.message.includes('Proxy connection');
 
       if (isRetryableError && retries < maxRetries) {
         retries++;

src/lib/smart-poller.ts

@@ -227,7 +227,8 @@ export class SmartPoller {
           error.message?.includes('timeout') ||
           error.message?.includes('network') ||
           error.message?.includes('ECONNRESET') ||
-          error.message?.includes('socket hang up');
+          error.message?.includes('socket hang up') ||
+          error.message?.includes('Proxy connection');
 
         // 网络错误时进行轮询级别的重试，而不是直接中断整个流程
         if (isRetryableError && this.pollCount < this.options.maxPollCount) {