migrate from SQLite to PostgreSQL with Drizzle ORM

- Updated all packages to latest versions (React 19, Next.js 14.2.32)
- Replaced sqlite3 with pg and drizzle-orm dependencies
- Created complete PostgreSQL schema with relationships and indexes
- Migrated all API endpoints from SQLite to Drizzle queries
- Added database seeding with sample data
- Updated authentication to use bcrypt instead of pbkdf2
- Configured connection pooling for PostgreSQL
- Updated app version to 1.0.0
- All endpoints tested and working correctly

lib/db/connection.ts

@@ -0,0 +1,27 @@
+import { drizzle } from 'drizzle-orm/node-postgres';
+import { Pool } from 'pg';
+import * as schema from './schema';
+
+function createConnection() {
+  if (!process.env.DATABASE_URL) {
+    throw new Error('DATABASE_URL environment variable is required');
+  }
+
+  const pool = new Pool({
+    connectionString: process.env.DATABASE_URL,
+    ssl: false,
+    max: 10,
+    idleTimeoutMillis: 30000,
+    connectionTimeoutMillis: 2000
+  });
+
+  // Test connection
+  pool.on('error', (err) => {
+    console.error('Unexpected error on idle client', err);
+  });
+
+  return drizzle(pool, { schema });
+}
+
+export const db = createConnection();
+export { schema };