Add movement gallery wings with period interiors and expand timeline features.

Movement galleries split large catalogs into chronological wings (~55 works), use era-themed 3D interiors with side-wall windows, wing navigator on the back exit, and front archways between wings. Also adds painting annotations, timeline event guides, portrait hover highlights, and documentation/API updates.

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

scripts/migrate-painting-annotations.js

@@ -0,0 +1,18 @@
+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-painting-annotations.sql');
+  const sql = fs.readFileSync(sqlPath, 'utf8');
+  await pool.query(sql);
+  const { rows } = await pool.query(`SELECT COUNT(*)::int AS total FROM painting_annotations`);
+  console.log(`painting_annotations ready (${rows[0].total} rows)`);
+  await pool.end();
+}
+
+main().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});