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

src/components/public/ui.tsx

@@ -135,26 +135,4 @@ export function SkeletonCard({ lines = 3 }: { lines?: number }) {
   );
 }
 
-export function SkeletonTable({ rows = 5 }: { rows?: number }) {
-  return (
-    <div className="content-card" style={{ padding: "0.5rem 1rem 1rem" }}>
-      {Array.from({ length: rows }).map((_, i) => (
-        <div key={i} style={{ display: "flex", alignItems: "center", gap: "0.75rem", padding: "0.6rem 0", borderTop: i > 0 ? "1px solid color-mix(in srgb, var(--color-text-muted) 12%, transparent)" : undefined }}>
-          {i === 0 ? (
-            <>
-              <Skeleton style={{ height: "12px", width: "30%" }} />
-              <Skeleton style={{ height: "12px", width: "20%" }} />
-              <Skeleton style={{ height: "12px", width: "25%", marginLeft: "auto" }} />
-            </>
-          ) : (
-            <>
-              <Skeleton style={{ width: "28px", height: "28px", borderRadius: "8px" }} />
-              <Skeleton style={{ height: "14px", width: "35%" }} />
-              <Skeleton style={{ height: "14px", width: "20%", marginLeft: "auto" }} />
-            </>
-          )}
-        </div>
-      ))}
-    </div>
-  );
-}
+