fix(listing): require an authenticated session on sponsor utility endpoints

[rajanpanth]

check-slug, email-estimate and featured-posts under /api/sponsor-dashboard/listing are only called from the authenticated listing builder but had no session check. Adds a getUserSession gate to each, matching the other sponsor-dashboard routes, so they aren't callable anonymously.

Checked all call sites before changing:

• featured-posts / email-estimate — relative fetch from React Query, browser-side, cookies sent.
• check-slug — fetchSlugCheck uses plain axios rather than @/lib/api, so no Authorization header; getPrivyToken falls back to the privy-token cookie, so this still authenticates.

Happy to adjust if any of these are intended to be public.

pnpm check-types and pnpm lint pass.

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📥 Commits

Reviewing files that changed from the base of the PR and between af39bd1 and b6c0163.

📒 Files selected for processing (3)

• src/app/api/sponsor-dashboard/listing/check-slug/route.ts
• src/app/api/sponsor-dashboard/listing/email-estimate/route.ts
• src/app/api/sponsor-dashboard/listing/featured-posts/route.ts

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