docs: add troubleshooting guide link to issue template chooser

Users will now see the troubleshooting guide as the first option
when creating a new issue.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,8 @@
 blank_issues_enabled: false
 contact_links:
+  - name: Troubleshooting Guide
+    url: https://github.com/badrisnarayanan/antigravity-claude-proxy/blob/main/docs/troubleshooting.md
+    about: Check here first for common issues and solutions before creating a bug report
   - name: Google Cloud Support
     url: https://cloud.google.com/support
     about: For Google Cloud account or billing issues, contact Google Cloud directly

docs/troubleshooting.md

@@ -1,5 +1,16 @@
 # Troubleshooting
 
+## Quick Links
+
+- [Windows: OAuth Port Error (EACCES)](#windows-oauth-port-error-eacces)
+- ["Could not extract token from Antigravity"](#could-not-extract-token-from-antigravity)
+- [401 Authentication Errors](#401-authentication-errors)
+- [Rate Limiting (429)](#rate-limiting-429)
+- [Account Shows as "Invalid"](#account-shows-as-invalid)
+- [403 Permission Denied](#403-permission-denied)
+
+---
+
 ## Windows: OAuth Port Error (EACCES)
 
 On Windows, the default OAuth callback port (51121) may be reserved by Hyper-V, WSL2, or Docker. If you see: