Implement signal quality scoring system

- Updated execute endpoint to store context metrics in database
- Updated CreateTradeParams interface with 5 context metrics
- Updated Prisma schema with rsiAtEntry and pricePositionAtEntry
- Ran migration: add_rsi_and_price_position_metrics
- Complete flow: TradingView → n8n → check-risk (scores) → execute (stores)

prisma/migrations/20251030183114_add_rsi_and_price_position_metrics/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable
+ALTER TABLE "Trade" ADD COLUMN     "pricePositionAtEntry" DOUBLE PRECISION,
+ADD COLUMN     "rsiAtEntry" DOUBLE PRECISION;