refactor: code cleanup and App.jsx component split

fix: resolve HF Spaces deployment timeout

feat: optimize for HF Spaces deployment

fix(ci): move CI mock after language validation and same-language passthrough in translate

fix(ci): commit missing backend modules for app import

fix: resolve module discovery and validation issues in CI mode

feat: implement comprehensive CI/CD pipeline with mock AI mode

Initial commit: BAIF Offline Translation Portal with production Dockerfile and recent optimizations