chore: remove dead code, unused CSS, unused components, and clean up git tracking

- Remove storage/logs/ and prod.log from git tracking; add to .gitignore
- Remove unused AvatarCarousel and ArticleSlider components
- Remove unused SkeletonTable export from ui.tsx
- Remove unused ChevronDown import from admin layout
- Remove 13 unused CSS classes (icon-base, nav-*, navigation-icon*, .app.dark,
  text-body, transition-base, card-base, admin-info-grid, .coin.*)
- Remove duplicate translation keys (openMenu/closeMenu in en.json)
- Fix admin-bans to use Prisma-generated bans_type enum
- Create shared AdminPageHeader component and formatDate utility
- Add logger and generateRequestId for structured logging
- All 58 tests pass, typecheck clean, build succeeds

storage/logs/email-2026-07-07T19-45-53-334Z.html

@@ -1,13 +0,0 @@
-<!-- To: [email protected] | From:  | Subject: Verify your email · Epicnabbo -->
-<div style="font-family:sans-serif;line-height:1.5;color:#0f172a">
-      <h2 style="margin:0 0 0.5rem">Verify your email</h2>
-      <p>Welcome to Epicnabbo! Confirm this email address to finish setting up your account.</p>
-      <p style="margin:1.25rem 0">
-        <a href="https://epicnabbo.nl/verify?token=5e21ef6e09952e9bb7257d54c1fe896713c0f05e6d92a1f8669869d875ab2693&email=juanedavid%40hotmail.com"
-           style="display:inline-block;padding:0.6rem 1.2rem;border-radius:8px;background:#eeb425;color:#1a1a2e;font-weight:700;text-decoration:none">
-          Verify email
-        </a>
-      </p>
-      <p style="color:#64748b;font-size:0.875rem">If the button doesn't work, paste this link into your browser:</p>
-      <p style="color:#64748b;font-size:0.875rem;word-break:break-all">https://epicnabbo.nl/verify?token=5e21ef6e09952e9bb7257d54c1fe896713c0f05e6d92a1f8669869d875ab2693&email=juanedavid%40hotmail.com</p>
-    </div>