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>

backend/app/models/bet.py

@@ -58,11 +58,6 @@ class Bet(Base):
     status: Mapped[BetStatus] = mapped_column(Enum(BetStatus), default=BetStatus.OPEN)
     visibility: Mapped[BetVisibility] = mapped_column(Enum(BetVisibility), default=BetVisibility.PUBLIC)
 
-    # Blockchain integration
-    blockchain_bet_id: Mapped[int | None] = mapped_column(nullable=True)
-    blockchain_tx_hash: Mapped[str | None] = mapped_column(String(66), nullable=True)
-    blockchain_status: Mapped[str | None] = mapped_column(String(20), nullable=True)
-
     # Result
     winner_id: Mapped[int | None] = mapped_column(ForeignKey("users.id"), nullable=True)
     settled_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)

backend/app/models/wallet.py

@@ -12,7 +12,6 @@ class Wallet(Base):
     user_id: Mapped[int] = mapped_column(ForeignKey("users.id"), unique=True)
     balance: Mapped[Decimal] = mapped_column(Numeric(12, 2), default=Decimal("0.00"))
     escrow: Mapped[Decimal] = mapped_column(Numeric(12, 2), default=Decimal("0.00"))
-    blockchain_escrow: Mapped[Decimal] = mapped_column(Numeric(18, 8), default=Decimal("0.00000000"))
     currency: Mapped[str] = mapped_column(String(3), default="USD")
     created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
     updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)