feat(oauth): use conventional client_id path for clean brand display
Change OAuth client_id from /oauth/client-metadata.json to
/oauth-client-metadata.json to match atproto's "conventional" pattern.
This causes the PDS OAuth authorization screen to display just
"coves.social" instead of the full URL path, providing a cleaner
user experience.
Per atproto spec, a "conventional" client_id must be:
- https:// protocol
- pathname exactly /oauth-client-metadata.json
- no port or query string
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>