Fix database persistence and add analytics

- Fixed Prisma client not being available in Docker container
- Added isTestTrade flag to exclude test trades from analytics
- Created analytics views for net positions (matches Drift UI netting)
- Added API endpoints: /api/analytics/positions and /api/analytics/stats
- Added test trade endpoint: /api/trading/test-db
- Updated Dockerfile to properly copy Prisma client from builder stage
- Database now successfully stores all trades with full details
- Supports position netting calculations to match Drift perpetuals behavior

prisma/migrations/20251027080947_add_test_trade_flag/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Trade" ADD COLUMN     "isTestTrade" BOOLEAN NOT NULL DEFAULT false;