Scaffold Regress: Fastify+SQLite server and Vue frontend for the Ingress-style BTC Map capture game

- Server: NIP-98 nostr auth (session cookies), BTC Map sync, claim/link/field
  routes, physical-presence checks via geolocation distance. 31 tests passing.
- Frontend: Leaflet map, team pick, claim/link UI, Archipelago identity
  bridge vendored (nostr-provider.js) for dashboard launch support.
- Verified end-to-end against the live BTC Map API (167 real Madeira places)
  and via genuine NIP-98-signed HTTP requests against the built app.

server/src/db/database.ts

@@ -0,0 +1,30 @@
+import Database from 'better-sqlite3';
+import { mkdirSync } from 'node:fs';
+import { dirname } from 'node:path';
+import { migrations } from './migrations.js';
+
+export type DB = Database.Database;
+
+export function openDatabase(path: string): DB {
+  if (path !== ':memory:') mkdirSync(dirname(path), { recursive: true });
+  const db = new Database(path);
+  db.pragma('journal_mode = WAL');
+  db.pragma('foreign_keys = ON');
+  migrate(db);
+  return db;
+}
+
+function migrate(db: DB): void {
+  db.exec('CREATE TABLE IF NOT EXISTS schema_migrations (id INTEGER PRIMARY KEY, applied_at INTEGER NOT NULL)');
+  const applied = new Set(
+    db.prepare('SELECT id FROM schema_migrations').all().map((r) => (r as { id: number }).id),
+  );
+  const record = db.prepare('INSERT INTO schema_migrations (id, applied_at) VALUES (?, ?)');
+  for (const m of migrations) {
+    if (applied.has(m.id)) continue;
+    db.transaction(() => {
+      db.exec(m.sql);
+      record.run(m.id, Math.floor(Date.now() / 1000));
+    })();
+  }
+}