refactor(OpenCode TLS): 共用 httpsAgent 建立邏輯

app/preflight.js

@@ -7,8 +7,8 @@ import {
   GITEA_REPOSITORY,
   GITEA_SKIP_TLS_VERIFY,
   PR_NUMBER,
+  getOpenCodeHttpsAgent,
   getLLMConfig,
-  shouldSkipOpenCodeTLSVerify,
 } from './config.js';
 import { verifyRemoteAccess } from './git.js';
 import { step, line, ok, error } from './log.js';
@@ -30,7 +30,7 @@ const applyOpenCodeAuth = (headers) => {
 const opencodeAxiosOptions = (headers) => ({
   headers,
   timeout: 30000,
-  httpsAgent: shouldSkipOpenCodeTLSVerify() ? new https.Agent({ rejectUnauthorized: false }) : undefined,
+  httpsAgent: getOpenCodeHttpsAgent(),
 });
 
 function giteaErr(e) {