feat: add Evotor OAuth connection feature with formatted phone input
- Add EvotorConnection model to store user's Evotor access tokens
- Implement OAuth 2.0 flow: /evotor (view), /evotor/connect, /evotor/callback, /evotor/disconnect
- Add Evotor connection page with connected/disconnected states
- Implement phone input masking (+7 (XXX) XXX-XX-XX) using Inputmask
- Add Russian validation messages for form fields
- Update phone validator to match masked format
- Add httpx dependency for async OAuth token exchange
- Add Evotor settings to config: CLIENT_ID, CLIENT_SECRET, SCOPES
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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