feat: implement Member Directory header (issue#33)

[IshimweIsaac]

Overview

This PR implements the Member Directory page header for the /members route as outlined in Issue #33.

Closes #33

What was done

• Page created: Built app/(public)/members/page.tsx (header section only).
• Spec Alignment:
  • Implemented the page title "Member Directory" and description text.
  • Added two stat badges ACTIVE: {count} and VERIFIED: {count} pulled from the database via db.user.count().
  • Counts are cached via Redis with a 1-hour TTL using the existing getCachedOrFetch utility.
  • Badges sit to the right of the title on desktop and stack below on mobile (flex-col → md:flex-row).

Screenshots

(Desktop view showing layout and alignment)

Notes for Reviewer

• Full member directory listing is out of scope for this issue and will be addressed in ISSUE-036 — Member Directory page with filtering + pagination #36.