docs: add Chinese Harness quick start

[denial123789]

Summary

• add a concise Chinese README covering the verified source install, local-first runtime, and security boundaries
• document the native DeepSeek Harness MCP flow and companion portable Skill path
• link the bilingual official DSH showcase and v0.3.2 integration guide
• add a regression test for the language entry point and safe install commands

Validation

• npm run typecheck
• npx vitest run tests/unit/v1-local-first-spec.test.ts (4 passed)
• all 10 relative links resolve
• official showcase returns HTTP 200
• git diff --check