Upgrade Console SDK to 4.22 and fix review issues from PR #8

[jhadvig]

Summary

Follow-up to #8. Addresses the blocking and non-blocking issues identified during review.

Blocking fixes (runtime crash on OCP 5.0)

• SDK 4.22 upgrade — React 17→18, react-router v5→v7, react-i18next v11→v16, PatternFly 6.2→6.4, i18next 23→25
• useHistory → useNavigate — fixes react_router_dom.useHistory is not a function crash
• react-router-dom → react-router — deprecated module replaced in all imports
• getRiskColor case-insensitive — CRD serves Low/Medium/High/Critical, switch was matching lowercase only

Non-blocking fixes

• Remove exact from console-extensions.json (react-router v7 default)
• Add trailing newline to locale JSON
• Update consolePlugin.dependencies to >=4.22.0-0

Docs

• Replace template README with plugin-specific content
• Add mock-analysis-result.yaml for cluster testing without Lightspeed operator
• Add ONBOARDING-FINDINGS.md documenting API mismatches and dev environment setup

Supersedes #9 (rebased on top of #8).

Test plan

• yarn test — 56 tests pass
• yarn build — production webpack build succeeds with SDK 4.22
• Tested on OCP 5.0 cluster with mock AnalysisResult data

🤖 Generated with Claude Code

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@jhadvig: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/frontend	731dad8	link	true	/test frontend

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