Add Gitea integration for Telegram work mode

.env.example

@@ -23,3 +23,12 @@ CODEX_RESUME_JSON_FLAG_STYLE=before_resume
 
 # Optional: set this only if you want plain messages to behave like /ask.
 ALLOW_PLAIN_TEXT=true
+
+# Optional Gitea integration for repository, issue, pull request, and git auth workflows.
+GITEA_BASE_URL=https://gitea.example.com
+GITEA_USERNAME=
+GITEA_EMAIL=
+GITEA_TOKEN=
+GITEA_DEFAULT_OWNER=
+GITEA_DEFAULT_REPO=
+GITEA_GIT_AUTH_ENABLED=true