fix(google-analytics): remove unnecessary runtime.fetch guard

[yuriassuncx]

Summary

• Removes the unnecessary if (runtime.fetch) guard in server/main.ts, aligning with the standard pattern used by all other MCPs (e.g. google-sheets, google-calendar, etc.)
• With the guard, a falsy runtime.fetch would silently prevent the server from starting — the new pattern makes this failure visible

Test plan

• Server starts correctly locally (bun run dev in google-analytics/)
• OAuth authorize endpoint redirects to Google with correct client_id (verified locally)
• No functional change in prod — server was already running, this is a cleanup

🤖 Generated with Claude Code

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Summary by cubic

Removed the unnecessary if (runtime.fetch) guard in google-analytics/server/main.ts and now always call serve(runtime.fetch). This matches other MCPs and makes startup failures visible instead of silently not starting.

^{Written for commit 429fd16. Summary will update on new commits.}