[Build] Add real-time loading progress bar with clinic names

## GitHub Update **Repository:** [MKWcorp/sales-race-beautycenter](https://github.com/MKWcorp/sales-race-beautycenter) **Author:** multimediadrw **Date:** 12/8/2025, 10:42:01 AM **Commit:** [`3a9617c`](https://github.com/MKWcorp/sales-race-beautycenter/commit/3a9617cc820178140b6b81cbc215b4edaaf3b37c) ### Commit Message Add real-time loading progress bar with clinic names Features: - Progress bar shows percentage and clinic being fetched - Real-time updates via Server-Sent Events (SSE) - Shows 'Fetching: [Clinic Name]' during load - Displays X/Y clinics processed - Smooth progress bar animation with gradient - Better UX - users can see actual progress instead of spinner Technical: - New /api/sales-progress route with streaming - Progress updates sent per clinic (0-100%) - Frontend uses ReadableStream reader - Loading state shows progress card instead of spinner --- _This story was imported from historical commits._