saridsa2 d819888351 feat: appointment QR code — generated and sent via WhatsApp after booking ...

- QrService: generates QR PNG from appointment data, cached in-memory
- GET /api/messaging/qr/:appointmentId serves the image (Gupshup needs URL)
- sendImage added to MessagingProvider + GupshupProvider
- send_appointment_qr tool registered in ToolRegistry
- Flow JSON updated: QR sent after booking confirmation
- Variable interpolation now supports dot notation ({{result.field}})
- SIDECAR_PUBLIC_URL env var for the QR image URL

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-20 20:23:06 +05:30

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