refactor: migrate from node-sqlite3-wasm to better-sqlite3

Replace all db.run(sql, [params]) calls with db.prepare(sql).run(...params)
across all source modules and test files. Also remove the node-sqlite3-wasm
import from tests/db.test.ts and update the type annotation accordingly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

display/middleware/src/db/migrations/001-initial.ts

@@ -1,4 +1,4 @@
-import { Database } from 'node-sqlite3-wasm';
+import Database from 'better-sqlite3';
 
 export function migrate001(db: Database): void {
   db.exec(`