feat(integration): complete backend-frontend integration

Feature/frontend backend integration

Author: ayushkrtiwari

.env.example

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+# Backend API Configuration
+DATABASE_URL=postgresql+asyncpg://postgres:password@localhost:5432/qrs
+REDIS_URL=redis://localhost:6379/0
+
+# Security
+SECRET_KEY=your-secret-key-change-this-in-production
+ALGORITHM=HS256
+ACCESS_TOKEN_EXPIRE_MINUTES=30
+
+# CORS
+CORS_ORIGINS=http://localhost:5173,http://localhost:3000,http://localhost:8080
+
+# Finnhub API (optional - will use mock data if not provided)
+FINNHUB_API_KEY=
+
+# Output directory for backtest results
+OUTPUT_DIR=./output
+
+# Server
+HOST=0.0.0.0
+PORT=8000