fix: switch from better-sqlite3 to bun:sqlite (built-in)

[moderniselife]

better-sqlite3 is a native addon that requires node-gyp + make to compile, which fails in Bun's Docker image. Bun has a built-in SQLite module with a nearly identical API.

Changes:

• Import { Database } from 'bun:sqlite' instead of better-sqlite3
• Use db.exec('PRAGMA ...') instead of db.pragma('...')
• Use new Database(path, { create: true }) constructor
• Remove .changes property usage (bun:sqlite .run() returns void)
• Add 'bun-types' to tsconfig.json types array
• Remove better-sqlite3 and @types/better-sqlite3 from package.json