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/actions/admin-bans.ts

@@ -5,8 +5,9 @@ import { requireStaffRateLimited as requireStaff } from "@/lib/admin/guard";
 import { prisma } from "@/lib/prisma";
 import { rcon } from "@/lib/services/rcon";
 import { logStaffActivity } from "@/lib/services/staff-activity";
+import type { $Enums } from "@/generated/prisma/client";
 
-type BanType = "account" | "ip" | "machine" | "super";
+type BanType = $Enums.bans_type;
 const BAN_TYPES: ReadonlySet<string> = new Set(["account", "ip", "machine", "super"]);
 const PERMANENT_SECONDS = 100 * 365 * 24 * 3600;