ci: add project quality checks

[LRriver]

Summary

• add GitHub Actions CI for backend tests/compile, frontend lint/unit/build, and Playwright smoke tests
• add ESLint flat config so the existing frontend lint script is runnable under ESLint 9
• remove the direct vite-node devDependency because the declared version is not available from npm and breaks reproducible npm ci installs
• add CI badges to the English and Chinese READMEs

Local verification

• npm ci in frontend/
• python -m pytest -q -> 92 passed, 4 warnings
• python -m compileall -q backend
• npm run lint -> 0 errors, 27 warnings from existing frontend any/hook/Fast Refresh rules
• npm test -- --run -> 25 passed
• npm run build
• npm run test:e2e -- interactive-artifacts.spec.ts -> 1 passed
• git diff --check

Notes

• Real model/PPT generation is intentionally not a blocking CI check because it depends on local secrets and external model availability.
• npm audit is intentionally not blocking yet; the current dependency tree reports existing vulnerabilities unrelated to this CI change.

[gemini-code-assist]

Code Review

This pull request adds a CI workflow badge to both the English and Chinese README files, introduces a new ESLint configuration file for the frontend, and removes the unused vite-node dependency from the frontend package configuration. There are no review comments, and I have no feedback to provide.

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[Copilot]

Pull request overview

Adds a GitHub Actions CI pipeline and supporting frontend tooling updates to enforce baseline project quality checks (backend tests/compile, frontend lint/unit/build, and Playwright smoke), while keeping external/secret-dependent checks non-blocking.

Changes:

• Introduces a CI workflow that runs backend pytest/compileall, frontend lint/unit/build, and a Playwright smoke test, with report upload.
• Adds an ESLint 9 flat config (eslint.config.js) so the existing npm run lint works under ESLint 9.
• Removes vite-node from frontend dependencies (previously declared version not available), and adds CI badges to both READMEs.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
README.md	Adds CI badge pointing to the new workflow.
README_zh.md	Adds CI badge pointing to the new workflow.
frontend/package.json	Removes vite-node devDependency (nonexistent version).
frontend/package-lock.json	Removes vite-node from the lockfile.
frontend/eslint.config.js	Adds ESLint 9 flat config for the frontend.
.github/workflows/ci.yml	Adds CI workflow for backend + frontend + Playwright smoke tests.

Files not reviewed (1)

• frontend/package-lock.json: Generated file

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