Use ordered SQLite migrations (Refs #75)

src/lib/server/auth/schema.ts

@@ -1,7 +1,5 @@
 import type Database from 'better-sqlite3';
-const initialized = new WeakSet<Database.Database>();
-export function ensureAuthSchema(handle: Database.Database): void {
-    if (initialized.has(handle)) return;
+export function migrateAuthSchema(handle: Database.Database): void {
     handle.exec(`
         CREATE TABLE IF NOT EXISTS auth_users (
             id TEXT PRIMARY KEY, username TEXT NOT NULL COLLATE NOCASE UNIQUE,
@@ -24,5 +22,4 @@ export function ensureAuthSchema(handle: Database.Database): void {
         );
         CREATE INDEX IF NOT EXISTS auth_audit_created_at ON auth_audit(created_at);
     `);
-    initialized.add(handle);
 }