chore: update dotenv configuration and dependencies

- Replaced 'dotenv/config' with 'dotenv-expand/config' in env.ts and cli.ts for enhanced environment variable handling.
- Added 'dotenv-expand' as a dependency in package.json and updated pnpm-lock.yaml accordingly.

Signed-off-by: Innei <tukon479@gmail.com>

package.json

@@ -29,6 +29,7 @@
   "devDependencies": {
     "@innei/prettier": "0.15.0",
     "consola": "3.4.2",
+    "dotenv-expand": "12.0.2",
     "eslint": "9.28.0",
     "eslint-config-hyoban": "4.0.8",
     "fast-glob": "3.3.3",