fix(proxy): prevent proxy recursion when system proxy points to localhost

Detect if HTTP_PROXY, HTTPS_PROXY, or ALL_PROXY environment variables
point to loopback addresses (localhost, 127.0.0.1), and bypass system
proxy in such cases to avoid infinite request loops.

src/types.ts

@@ -330,4 +330,3 @@ export interface OpenCodeMcpServerSpec {
   // 通用字段
   enabled?: boolean;
 }
-