fix(ci): configure CI env and fix TypeScript types

[qiuethan]

Summary

This PR fixes the frontend CI pipeline and TypeScript configuration. It addresses issues where import.meta.env was not properly typed, causing type-check failures, and ensures the VITE_API_BASE_URL is correctly properly available during the CI build process.

Related Issues

• Relates to CI pipeline configuration failures.

Changes

• TypeScript Configuration:
  • Created src/vite-env.d.ts with explicit ImportMetaEnv interface definitions to fix TS2339 errors regarding import.meta.env.
  • Updated tsconfig.app.json to strictly include src/vite-env.d.ts via the files array, ensuring types are always loaded.guarantees the build environment matches local configuration patterns.
• Documentation & Setup:
  • Added .env.example to guide local development setup.

How to Test

1. Local:
   • Run npm install in frontend/.
   • Run npm run type-check. It should pass without errors.
   • Run npm run dev. The app should start and connect to http://localhost:8000/api/v1 (verify in network tab or console).
2. CI:
   • Push these changes.
   • Check the "Frontend CI" action on GitHub.
   • Verify that the "Run type checking" and "Build application" steps pass.

Checklist

• Tests added or updated (CI & Types)
• CI passes (lint, tests, build)
• Documentation updated (README, .env.example)
• No secrets or credentials committed

[vivjd]

LGTM🫡