add project

.env.example

@@ -0,0 +1,24 @@
+# PostgreSQL
+DB_HOST=localhost
+DB_PORT=5432
+DB_USER=postgres
+DB_PASSWORD=postgres
+DB_NAME=cryptowallet_v2
+
+# JWT (external auth service)
+JWT_JWKS_URL=
+JWT_PUBLIC_KEY=
+JWT_ALGORITHM=RS256
+JWT_ISSUER=
+JWT_AUDIENCE=
+
+# Server
+API_PORT=3001
+FRONTEND_URL=http://localhost:3000
+RELAY_API_KEY=
+
+# TRON
+TRON_API_KEY=
+
+# Jupiter (Solana DEX aggregator)
+JUPITER_API_KEY=