Add Platform Presence Scanner for URL import distribution scoring.

feat: full cover+genre extraction from all platforms - platform HTML parsers + DB fields

fix: resolve Pyrefly unknown-name errors in book.py

feat: deep book metadata extraction - author bio, genre, ratings, pages

feat: book URL import - 10 platforms, 3-step UI, scraper service

Phase 1.2+5.1+6.2+6.5: Book cover upload with resizing, conversion funnel analytics, intent distribution, backup system, CI/CD pipeline

Wire all frontend features to real backend APIs: widget-config, profile, personality, notifications, smart-links, token-usage, grant-by-email, fix password endpoint

Restructure project for HF Spaces deployment