Remove Plausible references from analytics tool

[guitavano]

Summary

• Remove mentions of Plausible and OneDollarStats from the analytics query tool descriptions and comments since we no longer use Plausible.

Test plan

• Verify bun run check passes
• Confirm analytics tool still works as expected

🤖 Generated with Claude Code

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Summary by cubic

Removed Plausible/OneDollarStats mentions from the analytics_query tool comments and description to make analytics wording vendor-agnostic. No behavior changes; options and API remain the same.

^{Written for commit 2880ee9. Summary will update on new commits.}