Add compatibility for providers that use ANTHROPIC_API_KEY instead of
ANTHROPIC_AUTH_TOKEN, enabling support for AiHubMix and similar services.
Changes:
- Backend: Add fallback to ANTHROPIC_API_KEY in credential extraction
- migration.rs: Support API_KEY during config migration
- services/provider.rs: Extract credentials from either field
- Frontend: Smart API key field detection and management
- getApiKeyFromConfig: Read from either field (AUTH_TOKEN priority)
- setApiKeyInConfig: Write to existing field, preserve user choice
- hasApiKeyField: Detect presence of either field
- Add AiHubMix provider preset with dual endpoint candidates
- Define apiKeyField metadata for provider presets (documentation)
Technical Details:
- Uses or_else() for zero-cost field fallback in Rust
- Runtime field detection ensures correct field name preservation
- Maintains backward compatibility with existing configurations
- Priority: ANTHROPIC_AUTH_TOKEN > ANTHROPIC_API_KEY
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