Update from code changes: sync Activity API events and limits to Spanish

[mintlify]

Summary

Syncs the X Activity API introduction across all localized versions with the recent English updates to private events and subscription limits.

Changes

• Adds post.mention.create to the Post events table.
• Adds the "Current private events" bullet list (likes, encrypted chat, DMs, typing indicator, post mentions).
• Updates subscription limits: Self-serve 1,500 · Enterprise 75,000 · Partner 150,000.
• Applied to Spanish, Japanese, Portuguese, and Korean translations.

Context

The English page was updated in the upstream source change; the translations were still showing the older event list and prior limits (1,000 / 50,000 / 100,000).

Update history

• Synced the Spanish translation of x-api/activity/introduction.mdx with the English private events and subscription limits updates.
• Mirrored the same updates into the Japanese, Portuguese, and Korean translations.
• Re-triaged the same source change against this PR; all four translations already reflect the update, no additional docs changes required.
• Re-triaged the source change again; branch is still fully in sync, no additional docs changes required.

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[mintlify]

Update from code changes updated this PR.

No changes made in this update

[mintlify]

Update from code changes updated this PR.

Made no changes as branch already covers the source update