Add dev-prod harmonize tool for bidirectional catalog and image sync.

Schema migrates dev to prod only; catalog rows merge by updated_at and images by mtime with union merge and conflict reporting.

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

scripts/harmonize-schema.js

@@ -0,0 +1,54 @@
+/**
+ * Migrate prod schema from dev migrations (schema dev → prod only).
+ *
+ * Usage: npm run harmonize:schema
+ */
+const { spawnSync } = require('child_process');
+const path = require('path');
+const { rootDir, loadProdPgConfig, confirmProdAction } = require('./db-env');
+const { printCliResult } = require('./lib/cli-result');
+
+async function main() {
+  if (process.env.CONFIRM_PROD !== '1') {
+    await confirmProdAction('Apply dev migrations to gallery_prod schema?');
+  }
+
+  const prodConfig = loadProdPgConfig();
+  const env = {
+    ...process.env,
+    DB_HOST: prodConfig.host,
+    DB_PORT: String(prodConfig.port),
+    DB_USER: prodConfig.user,
+    DB_PASSWORD: prodConfig.password,
+    DB_NAME: prodConfig.database,
+  };
+
+  const result = spawnSync(process.execPath, [path.join(rootDir, 'server', 'migrate.js')], {
+    cwd: rootDir,
+    env,
+    stdio: 'inherit',
+  });
+
+  if (result.status !== 0) {
+    printCliResult({
+      script: 'harmonize-schema',
+      ok: false,
+      summary: 'Prod schema migration failed.',
+    });
+    return;
+  }
+
+  printCliResult({
+    script: 'harmonize-schema',
+    ok: true,
+    summary: 'Prod schema migrated from dev migration files (gallery_prod).',
+  });
+}
+
+main().catch((err) => {
+  printCliResult({
+    script: 'harmonize-schema',
+    ok: false,
+    summary: err.message,
+  });
+});