feat: build protocol explorer page

[EmeditWeb]

Problem

There is no page showing live protocol activity.
Sponsors and mentors want to see what loans are
active and how the protocol is performing.

What To Build

Build /explorer page showing:

• Recent loans (paginated table):
  borrower wallet, vendor, amount, status,
  installments paid/total
• Pool activity (deposits, withdrawals)
• Recent vouches
• Protocol stats bar at top

All data from live API. Refresh every 30 seconds.
No auth required to view.

Files To Touch

• src/pages/Explorer.tsx (new)
• src/router/index.tsx
• src/components/layout/Navbar.tsx (add Explorer link)

Acceptance Criteria

• Loans table loads and paginates
• Auto-refreshes every 30 seconds
• Wallet addresses truncated with copy button
• Status badges show correct colors
• No auth required

Mandatory Checks Before PR

• npm run build passes
• No any types
• PR references this issue

[Iwayemi-Kehinde]

I would like to work on this issue as I have reviewed the scope, I should have a PR Ready in 50 minutes.