fix(mobile): optimize frame extraction with scaling and allow direct video URLs

Enhance downloader and downloader fixes

Fix Pro rate limit check with Supabase Auth

FEAT: Admin endpoint for email retrieval

PHASE 4: Batch Analysis Endpoint (Pro Only)

PHASE 4: Email capture for lead gen

PHASE 3: Shareable reports storage + Plausible analytics

FIX: Add /usage endpoint for counter refresh + enhanced loading screen

SECURITY: Enhanced URL and file validation

SECURITY: Add fingerprint header support for VPN-resistant tracking

FEATURE: Freemium model - Rate limiting, Gumroad verification, License logic

Deploy VeriVid Backend to Hugging Face Spaces