feat(google): Calendar discovery document endpoint

[yonatangross]

Summary

• Add GET /discovery/v1/apis/calendar/v3/rest endpoint to the Google emulator
• Returns a minimal Google API Discovery Document describing implemented Calendar routes
• Enables google-api-python-client build("calendar", "v3") and similar SDK bootstrapping against the emulator
• No auth required (matches real Google API behavior)

Changes

File	Change
routes/calendar.ts	Add discovery endpoint with calendarList, events, freebusy resources (+85 LOC)
google.test.ts	Test: status 200, correct schema fields, all implemented methods described (+33 LOC)

How it works

The endpoint returns a static JSON document following the Google Discovery format:

{
  "kind": "discovery#restDescription",
  "name": "calendar",
  "version": "v3",
  "rootUrl": "http://localhost:4005/",
  "servicePath": "calendar/v3/",
  "resources": {
    "calendarList": { "methods": { "list": {...} } },
    "events": { "methods": { "list": {...}, "insert": {...}, "delete": {...} } },
    "freebusy": { "methods": { "query": {...} } }
  }
}

rootUrl is dynamic — it reflects the server's actual origin so SDK clients connect to the right host.

Test plan

• GET /discovery/v1/apis/calendar/v3/rest returns 200
• Response has correct kind, name, version, id fields
• rootUrl reflects server origin
• All implemented resources described: calendarList.list, events.list/insert/delete, freebusy.query
• No auth required to access discovery endpoint
• Full monorepo test suite passes (383 tests, 0 failures)
• Lint + type-check clean

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