refactor: migrate from better-sqlite3 to bun:sqlite

- Updated build-hooks.js to remove better-sqlite3 dependency and use bun:sqlite.
- Modified smart-install.js to eliminate checks and installations related to better-sqlite3.
- Refactored Database.ts, SessionSearch.ts, SessionStore.ts, and migrations.ts to import and utilize bun:sqlite.
- Replaced exec and pragma calls with appropriate run methods for bun:sqlite compatibility.
- Removed unnecessary native module verification and installation logic for better-sqlite3.

src/services/sqlite/Database.ts

@@ -1,4 +1,4 @@
-import { Database } from 'better-sqlite3';
+import { Database } from 'bun:sqlite';
 import { DATA_DIR, DB_PATH, ensureDir } from '../../shared/paths.js';
 
 export interface Migration {