Fix 001_init.js database column mismatch

- Removed must_change_password field that doesn't exist in admin_users table
- Changed from using db to knex parameter for database operations
- Fixed require statement that was accidentally changed
- Updated security message to reflect no forced password change
- Removed debug logging after identifying the issue

The error occurred because 001_init.js was trying to insert a column
that doesn't exist in the admin_users table schema created by
initializeDatabase().

backend/migrations/run-migrations-safe.js

@@ -141,7 +141,6 @@ async function runMigrations() {
           const numB = parseInt(baseB.split('_')[0]);
           return numA - numB;
         });
-      console.log('Migration files in order:', migrationFiles.map(f => path.basename(f)));
     } else {
       // For existing deployments, run all migrations (legacy + core)
       console.log('Existing deployment detected - checking all migrations');