fix(gitea TLS): 固定略過憑證驗證並改用 Gitea context

app/preflight.js

@@ -5,7 +5,6 @@ import {
   GITEA_COMMENT_TOKEN,
   GITEA_SERVER_URL,
   GITEA_REPOSITORY,
-  GITEA_SKIP_TLS_VERIFY,
   PR_NUMBER,
   getOpenCodeHttpsAgent,
   getLLMConfig,
@@ -13,7 +12,7 @@ import {
 import { verifyRemoteAccess } from './git.js';
 import { step, line, ok, error, result } from './log.js';
 
-const httpsAgent = GITEA_SKIP_TLS_VERIFY ? new https.Agent({ rejectUnauthorized: false }) : undefined;
+const httpsAgent = new https.Agent({ rejectUnauthorized: false });
 const api = (path) => `${GITEA_SERVER_URL.replace(/\/$/, '')}/api/v1${path}`;
 const giteaHeaders = (token) => ({ Authorization: `token ${token}`, 'Content-Type': 'application/json' });
 const opencodeModelConfig = (model) => {