Add NestJS fabric trade API with Prisma and Docker

Provide backend for admin and user apps with Postgres, migrations, seed data, and docker-compose for LiteSpeed reverse-proxy deployment.

Co-authored-by: Cursor <cursoragent@cursor.com>

.env.example

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+# Local / host Prisma
+DATABASE_URL="postgresql://fabric:fabric123@localhost:5432/fabric_trade?schema=public"
+
+# Docker Compose
+POSTGRES_USER=fabric
+POSTGRES_PASSWORD=fabric123
+POSTGRES_DB=fabric_trade
+POSTGRES_PORT=5432
+API_PORT=3000
+RUN_SEED=false
+
+JWT_SECRET="fabric-trade-dev-secret-change-me"
+JWT_EXPIRES_IN="7d"
+PORT=3000
+MOCK_OTP_CODE="123456"
+OTP_TTL_MINUTES=5