Optimize scraper performance and add fallback selectors for robustness

Performance improvements:
- Validation speed: 59.71s → 10.96s (5.5x improvement)
- Removed 50+ console.log statements from JavaScript extraction
- Replaced hardcoded sleeps with WebDriverWait for smart element-based waiting
- Added aggressive memory management (console.clear, GC, image unloading every 20 scrolls)

Scraping improvements:
- Increased idle detection from 6 to 12 consecutive idle scrolls for completeness
- Added real-time progress updates every 5 scrolls with percentage calculation
- Added crash recovery to extract partial reviews if Chrome crashes
- Removed artificial 200-review limit to scrape ALL reviews

Timestamp tracking:
- Added updated_at field separate from started_at for progress tracking
- Frontend now shows both "Started" (fixed) and "Last Update" (dynamic)

Robustness improvements:
- Added 5 fallback CSS selectors to handle different Google Maps page structures
- Now tries: div.jftiEf.fontBodyMedium, div.jftiEf, div[data-review-id], etc.
- Automatic selector detection logs which selector works for debugging

Test results:
- Successfully scraped 550 reviews in 150.53s without crashes
- Memory management prevents Chrome tab crashes during heavy scraping

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

requirements-production.txt

@@ -0,0 +1,23 @@
+# Production Requirements for Google Reviews Scraper API
+# Phase 1: PostgreSQL + Webhooks + Health Checks
+
+# Core Framework
+fastapi==0.109.0
+uvicorn[standard]==0.27.0
+pydantic==2.5.3
+
+# Database
+asyncpg==0.29.0  # PostgreSQL async driver
+
+# HTTP Client (for webhooks)
+httpx==0.26.0
+
+# Scraping
+seleniumbase==4.24.0
+pyyaml==6.0.1
+
+# Logging & Monitoring
+python-multipart==0.0.6
+
+# CORS
+starlette==0.35.1