refactor: update router import path and add random ID utility

- Changed the import path for router types from '@kevisual/router' to './route.ts' in src/router-define.ts.
- Added a new lock file (bun.lock) to manage dependencies.
- Introduced a new utility function in src/utils/random.ts to generate random IDs using the nanoid library.

src/utils/random.ts

@@ -0,0 +1,8 @@
+import { customAlphabet } from 'nanoid';
+
+const nanoid = customAlphabet('abcdefghijklmnopqrstuvwxyz', 16);
+
+export const randomId = (length: number = 8, affix: string = '') => {
+  return affix + nanoid(length);
+}
+export { nanoid };