v1.4.0

• f278cb7 Merge pull request #144 from seakee/sync/upstream-main-20260526
• 4f4c265 Update README.md
• e6b2714 ✨ feat(monitoring): surface xAI quota in account views
• 57494f0 ✨ feat(quota): add xAI Grok quota support
• 68d45d5 ✨ feat(auth-files): add Codex websockets toggle
• e383951 🔧 fix(auth): include backend detail in login failures
• 72446cb 🔧 fix(config): preserve source edits during visual saves
• 80c5da4 ✨ feat(providers): support auth-index backed model checks
• 516221f 🔧 fix(providers): preserve auth index provider fields
• 403f62a Merge pull request #143 from seakee/docs/maintenance-mode-readme
• 368f48b 📝 docs(readme): document maintenance mode and migration path