chore: add screenshots to README

[mackeh]

Summary

• What changed?
• Why was this needed?

Validation

• cd apps/server && npm test
• cd apps/server && npm run build
• cd apps/web && npm test
• cd apps/web && npm run build
• Manual QA performed (describe below)

Manual QA Notes

• Steps executed:
• Result:

Screenshots / Recordings (UI changes)

• Attach before/after evidence when applicable.

API / Schema / Config Impact

• No API changes
• API changes documented in docs/API_REFERENCE.md
• New env/config documented (README.md / .env.example)
• Migration required (describe)

Security / Permissions

• No security impact
• Permission checks added/updated
• Audit events added/updated

Documentation

• README.md updated (if user-facing behavior changed)
• docs/ARCHITECTURE.md updated (if architecture changed)
• docs/CONTRIBUTING.md / onboarding docs updated (if contributor workflow changed)

Risks and Rollback

• Main risks:
• Rollback plan: