Add Windows setup script for new instances

Standalone batch file: clones (or pulls), installs, builds, seeds the
reporter settings, and writes a start-autofirmer.bat. Prompts for the master
dashboard URL and instance name, defaulting to %COMPUTERNAME%.

Two install hazards it handles:
- better-sqlite3 has no prebuilt binary above Node 22, so install silently
  falls back to node-gyp and dies without Visual Studio Build Tools. The
  script warns first and names the fix if install fails anyway
- playwright is declared but referenced nowhere in the source, so its
  postinstall browser download is skipped

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

scripts/seed-settings.js

@@ -0,0 +1,31 @@
+/**
+ * Writes the reporter settings into autotrader.sqlite before first launch.
+ *
+ * lib/db.ts seeds these keys with INSERT OR IGNORE, so values written here
+ * survive the app's own startup seeding. Must be run from the project root —
+ * lib/db.ts opens the database at process.cwd().
+ *
+ *   node scripts/seed-settings.js <master_dashboard_url> <instance_name>
+ */
+const path = require('path');
+const Database = require('better-sqlite3');
+
+const [, , url, name] = process.argv;
+
+const db = new Database(path.join(process.cwd(), 'autotrader.sqlite'));
+db.exec(`
+    CREATE TABLE IF NOT EXISTS settings (
+        key   TEXT PRIMARY KEY,
+        value TEXT NOT NULL
+    );
+`);
+
+const upsert = db.prepare(
+    'INSERT INTO settings (key, value) VALUES (?, ?) ' +
+    'ON CONFLICT(key) DO UPDATE SET value = excluded.value'
+);
+
+if (url)  { upsert.run('master_dashboard_url', url);  console.log('  master_dashboard_url = ' + url); }
+if (name) { upsert.run('instance_name', name);        console.log('  instance_name        = ' + name); }
+
+db.close();