Add PainterPalette integration, canonical DB schema, and influence UI fixes.

Integrate Inputs/PainterPalette.csv for artist metadata and influence links, add db/schema.sql with server/migrate.js, letterbox influence panel thumbnails, and refresh Titian/Pontormo images.

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

server/migrate.js

@@ -0,0 +1,45 @@
+require('dotenv').config();
+const fs = require('fs');
+const path = require('path');
+const pool = require('./db');
+
+const INCREMENTAL_MIGRATIONS = [
+  'migrate-checkup-flags.sql',
+  'migrate-artist-checkup-flags.sql',
+  'migrate-influence-sources.sql',
+  'migrate-painting-annotations.sql',
+  'migrate-artist-palette.sql',
+];
+
+async function applySqlFile(label, filePath) {
+  const sql = fs.readFileSync(filePath, 'utf8');
+  await pool.query(sql);
+  console.log(`  ${label}`);
+}
+
+async function migrate() {
+  const dbDir = path.join(__dirname, '..', 'db');
+  const schemaPath = path.join(dbDir, 'schema.sql');
+
+  console.log('Applying db/schema.sql …');
+  await applySqlFile('schema.sql', schemaPath);
+
+  console.log('Applying incremental migrations …');
+  for (const file of INCREMENTAL_MIGRATIONS) {
+    const filePath = path.join(dbDir, file);
+    if (!fs.existsSync(filePath)) {
+      console.warn(`  skipped (missing): ${file}`);
+      continue;
+    }
+    await applySqlFile(file, filePath);
+  }
+
+  console.log('Database migration complete.');
+}
+
+migrate()
+  .then(() => pool.end())
+  .catch((err) => {
+    console.error('Migration failed:', err.message);
+    pool.end().finally(() => process.exit(1));
+  });