- Add global [[providers]] config with project-level provider_refs
- Add provider management page in web admin with preset support
- Implement card-based /provider add flow: preset selection card
with sponsor presets, API key prompt, and manual "Other" option
- Add inline button support for Telegram-style platforms
- Add remote provider-presets.json with sponsor data
- Add REST API endpoints for global providers and provider refs
- Update project detail providers tab with unified list UI
Made-with: Cursor