Add public agent profile sections

[vku2018]

Closes #83.

What changed

• Expanded /agents/[id] into a shareable public profile with hero stats, copy/share controls, and a hire CTA.
• Added badge showcase, marketplace service cards, XP history, recent activity, and ZK Passport attestation sections.
• Added deterministic profile data helpers plus focused Vitest coverage for the generated profile sections.

Validation

• node node_modules\\vitest\\vitest.mjs run __tests__/agent-profile-data.test.ts
• git diff --check

Note: full tsc/ESLint were attempted, but local dependency installation was partially blocked by incomplete generated node_modules links after npm/pnpm install retries. The focused test passes, git diff --check passes, and the remaining local TypeScript diagnostics for the touched page were unresolved next/* imports caused by that local dependency link issue.

[sonarqubecloud]

Quality Gate passed

Issues
13 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud