fix: add uptimeSeconds and ISO timestamp to health endpoint

[fwseyi]

Summary

Adds uptimeSeconds to the GET /health response so operators and demos can see basic runtime metadata alongside the existing timestamp field.

Changes

apps/api/src/routes/public.ts

• Added uptimeSeconds: process.uptime() to the health response object
• All existing fields (ok, service, version, nodeEnv, network, sponsorshipEnabled, timestamp) unchanged

apps/api/src/routes/public.test.ts

• Added assertions for uptimeSeconds:
  • typeof response.body.uptimeSeconds === 'number'
  • response.body.uptimeSeconds >= 0

Test Results

✓ returns health metadata

✓ returns provider catalog and category groupings

✓ returns safe default analytics shape for fresh storage

✓ returns usage and analytics summaries from isolated sqlite storage

4/4 tests passing

Security

No secrets, environment variables, wallet addresses, or host internals exposed — only process.uptime() which is safe public metadata.

Closes #32

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