Add checkup review flags, duplicate detection, and corrected painting images.

Introduce checkup_checked/checkup_fixed on paintings with Checkup page filters and API. Fixed paintings auto-mark as reviewed. Add find-duplicates tooling and document debug/checkup workflow. Include Botticelli and Michelangelo image fixes from checkup.

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

scripts/migrate-checkup-flags.js

@@ -0,0 +1,26 @@
+require('dotenv').config();
+const fs = require('fs');
+const path = require('path');
+const pool = require('../server/db');
+
+async function main() {
+  const sqlPath = path.join(__dirname, '../db/migrate-checkup-flags.sql');
+  const sql = fs.readFileSync(sqlPath, 'utf8');
+  await pool.query(sql);
+  await pool.query(
+    `UPDATE paintings SET checkup_checked = true WHERE checkup_fixed = true AND NOT checkup_checked`
+  );
+  const { rows } = await pool.query(`
+    SELECT
+      COUNT(*) FILTER (WHERE checkup_checked)::int AS checked,
+      COUNT(*) FILTER (WHERE checkup_fixed)::int AS fixed
+    FROM paintings
+  `);
+  console.log(`checkup flags ready (${rows[0].checked} checked, ${rows[0].fixed} fixed)`);
+  await pool.end();
+}
+
+main().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});