Add SEO descriptions to API reference and event catalog pages

[mintlify]

Summary

Audit found 243 documentation pages missing the description frontmatter field, which hurts SEO and search snippets. This PR adds descriptions for all of them, each between 50–160 characters.

Changes

• 51 timeseries API reference pages in api-reference/data/timeseries/ now have descriptions explaining what data each endpoint retrieves (e.g. heart rate, glucose, sleep stages, etc.).
• 192 event catalog pages in event-catalog/ now have descriptions explaining when each webhook event is triggered, covering:
  • 60 daily.data.*.created events (new data ingested)
  • 60 daily.data.*.updated events (existing data updated)
  • 60 historical.data.*.created events (historical data sync completion)
  • Lab test, lab report parsing, provider connection/device, and continuous query events

Only frontmatter was modified — page content is untouched. All other pages already had complete and reasonable metadata. Snippet files in snippets/ were intentionally left alone since they are reusable components, not pages.

Validation

• mint validate — passed
• mint broken-links — passed
• All new descriptions are 50–160 characters and all titles remain under 60 characters

[mintlify]

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