fix(web): migrate to React Router 8

[JJordan0C]

Summary

Closes #25.

Migrate the web control plane from the removed react-router-dom v7 package to the patched react-router 8.3.0 release.

Implementation

• Replace react-router-dom with react-router.
• Update the five affected import sites.
• Raise the React and React DOM minimum to 19.2.7.
• Refresh the npm lockfile.
• Document the Node.js 22.22.0 minimum.
• Record the advisory remediation in SECURITY.md.

Validation

• npm ci: passed
• npm audit --audit-level=high: 0 vulnerabilities
• npm test: 13 passed
• npm run typecheck: passed
• npm run lint: passed
• npm run build: passed
• npm run test:e2e:local: passed
• Browser smoke test and route navigation: passed with no console errors
• cargo fmt --all -- --check: passed
• cargo test --locked --workspace: 429 passed, 1 ignored
• cargo clippy --locked --workspace --all-targets -- -D warnings: passed
• cargo build --locked --workspace: passed
• Codex offline tests: 20 passed
• Plugin validation and proof microbenchmark: passed
• git diff --check: passed

Risks/limitations

The frontend build now requires Node.js 22.22.0 or newer. The application remains a client-side SPA and does not enable React Server Component APIs.

Documentation/evidence

Updated README.md, CONTRIBUTING.md, the developer and control-plane documentation, and SECURITY.md.

AI assistance and human verification

AI assistance: investigation | code | tests | documentation
Human verification: Review the complete diff and personally confirm the validation results before publication.

[Punisheroot]

stay always safe!