Add API smoke tests and GitHub Actions CI (web build verification)

[AstroMen]

Motivation

• Provide a small, fast safety net that validates core API workflows and permissions on every merge.
• Ensure the frontend can build on CI so regressions in the Next.js app are caught early.
• Offer a simple, reproducible local command to run the same checks developers will see in CI.

Description

• Add in-repo API smoke tests under apps/dashboard_api/tests/ with an in-memory SQLite fixture (conftest.py) and a scenario that exercises ticket -> approve -> queue -> run -> finish.
• Tests cover the /health check and the admin permission guard via require_admin.
• Add .github/workflows/ci.yml with two jobs: api-tests (installs Python deps and runs pytest) and web-build (runs npm ci and npm run build in apps/dashboard_web).
• Update README.md and README.zh-CN.md to document the CI and show the local test command (PYTHONPATH=apps/dashboard_api pytest -q apps/dashboard_api/tests).

Testing

• Ran PYTHONPATH=apps/dashboard_api pytest -q apps/dashboard_api/tests and the suite completed successfully (3 passed).
• Ran npm ci in apps/dashboard_web and dependency install succeeded.
• Ran npm run build in apps/dashboard_web and the Next.js production build completed successfully.

Codex Task

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Testing Result