docs: overhaul documentation for fork readiness
- Rewrite README from scratch: accurate stack versions, correct setup sequence, verified feature list, full API reference, architecture overview, and security model — all sourced directly from the codebase - Remove internal/stale docs: COLOR_SCHEME_MODERNIZATION.md, plan.md, frontend/README.md (CRA boilerplate) - Clean up DESIGN_SYSTEM.md: remove emoji headers and version footer - Fix WEEKLY_REPORT_FEATURE.md: replace hardcoded absolute paths with relative paths - Clean up test_cases_auth.md: remove stale branch and date references Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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