Add database setup script for GPU service

- Created scripts/setup-database.sql to create aitbc_gpu database
- Database configured with aitbc_gpu user and privileges

This is Phase 4.3c: Setup separate database for GPU service

apps/gpu-service/scripts/setup-database.sql

@@ -0,0 +1,19 @@
+-- Setup database for GPU service
+
+-- Create database
+CREATE DATABASE aitbc_gpu;
+
+-- Create user
+CREATE USER aitbc_gpu WITH PASSWORD 'password';
+
+-- Grant privileges
+GRANT ALL PRIVILEGES ON DATABASE aitbc_gpu TO aitbc_gpu;
+
+-- Connect to the database
+\c aitbc_gpu
+
+-- Grant schema privileges
+GRANT ALL ON SCHEMA public TO aitbc_gpu;
+
+-- Exit
+\q