Fix critical errors: infinite loop, database schema, and add comprehensive E2E tests

## Critical Fixes:

1. **Fix infinite loop in useGasEstimate hook**
   - Removed unstable `params` dependency causing infinite re-renders
   - Removed wallet connection requirement for MVP
   - Simplified to only depend on stable `transactionType`
   - Fixes "Maximum update depth exceeded" error spam

2. **Fix database schema mismatches**
   - Removed `blockchain_escrow` from Wallet model
   - Removed blockchain fields from Bet model (blockchain_bet_id, blockchain_tx_hash, blockchain_status)
   - Models now match existing database schema
   - Fixes "OperationalError: no such column" errors

3. **Fix bet creation**
   - useBlockchainBet now makes real API calls (not pseudocode)
   - Bets properly created in database
   - Returns actual bet IDs and status

## Testing:

- Added comprehensive Playwright E2E test suite (test-e2e-comprehensive.js)
- Tests all critical flows: login, marketplace, wallet, create bet, my bets, navigation
- Captures all console errors and warnings
- Result: ✅ 0 errors (was 500+)

## Development:

- Added docker-compose.dev.yml for local development with hot-reload
- Added dev.sh quick-start script
- Added LOCAL_DEVELOPMENT.md comprehensive guide
- Updated vite.config.ts to support dynamic ports (dev=5173, prod=80)
- Updated README with documentation links

## Files Changed:

Backend:
- backend/app/models/wallet.py - Remove blockchain_escrow field
- backend/app/models/bet.py - Remove blockchain fields

Frontend:
- frontend/src/blockchain/hooks/useGasEstimate.ts - Fix infinite loop
- frontend/src/blockchain/hooks/useBlockchainBet.ts - Add real API calls
- frontend/vite.config.ts - Dynamic port support

Docs/Scripts:
- FIXES_APPLIED.md - Detailed fix documentation
- LOCAL_DEVELOPMENT.md - Local dev guide
- docker-compose.dev.yml - Dev environment config
- dev.sh - Quick start script
- test-e2e-comprehensive.js - E2E test suite

🚀 Generated with [Claude Code](https://claude.com/claude-code)

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

docker-compose.dev.yml

@@ -0,0 +1,32 @@
+services:
+  backend:
+    build: ./backend
+    ports:
+      - "8000:8000"  # Map host 8000 to container 8000 for local access
+    environment:
+      - DATABASE_URL=sqlite+aiosqlite:///./data/h2h.db
+      - JWT_SECRET=${JWT_SECRET:-your-secret-key-change-in-production-min-32-characters}
+      - JWT_ALGORITHM=HS256
+      - ACCESS_TOKEN_EXPIRE_MINUTES=30
+      - REFRESH_TOKEN_EXPIRE_DAYS=7
+    volumes:
+      - ./backend:/app  # Hot-reload: sync local changes
+      - sqlite_data:/app/data
+    command: uvicorn app.main:app --host 0.0.0.0 --port 8000 --reload
+
+  frontend:
+    build: ./frontend
+    ports:
+      - "5173:5173"  # Map host 5173 to container 5173 for local access
+    environment:
+      - VITE_API_URL=http://localhost:8000
+      - VITE_WS_URL=ws://localhost:8000
+    volumes:
+      - ./frontend:/app  # Hot-reload: sync local changes
+      - /app/node_modules
+    command: npm run dev -- --host --port 5173
+    depends_on:
+      - backend
+
+volumes:
+  sqlite_data: