- Added validate_kiro_credentials() function to check credential availability
- Validates kiro IDE credentials from ~/.config/Code/User/globalStorage/amazon.q/credentials.json
- Validates kiro-cli credentials from ~/.local/share/kiro-cli/data.sqlite3
- Integrated validation into get_provider_models() to exclude providers without credentials
- Added validation checks to all request endpoints (chat, audio, images, embeddings)
- Providers only appear in model listings and accept requests when credentials are valid
- Returns HTTP 403 when credentials are missing or invalid