refactor: full codebase overhaul — dead code removal, env validation, logger migration, date consolidation, Prisma schema cleanup, button consistency, useEffect deps, test coverage

- env.ts: added 10 missing Zod-validated env vars (imager, paypal currency, argon2/bcrypt params)
- Migrated 6 modules from process.env to validated env.* (auth, proxy-auth, paypal, password, redis, imager, moderation, alert, logger)
- Replaced console.warn/error with pino logger in 9 server-side modules
- Removed 50+ dead exports (SWF wrappers, coalesceHotelName, signIn, isStaff re-export, formatTimestamp, Skeleton/SkeletonCard, 4 unused housekeeping sections)
- Consolidated date formatting: 28 files migrated to shared formatDate() from @/lib/format-date
- Wired 4 radio/settings API routes through cached siteSettings service instead of raw Prisma queries
- Added getMany()/getAll() helpers to SiteSettings service
- Removed 88 dead Prisma model definitions (schema 2763→1846 lines)
- Created admin action-helper.ts with wrapAction() for standardized error handling
- Fixed useEffect dependency arrays in 4 data-heavy components
- Replaced raw btn CSS classes with shadcn Button component across admin pages
- Stripped dead i18n namespaces (common, pages.client) from all 22 translation files
- Removed 2 dead scripts (create-release.sh, check-local-imports.ts)
- Fixed knip.json configuration
- Added 7 new test suites: format-date, paypal, moderation, alert, webhook, action-helper, and fixed password.test.ts for env mocking
- All 358 tests passing across 72 test files
- TypeScript: 0 errors

src/app/admin/shop/[id]/page.tsx

@@ -3,6 +3,7 @@ import Link from "next/link";
 import { notFound, redirect } from "next/navigation";
 import { getTranslations } from "next-intl/server";
 import { deleteShopArticle, updateShopArticle } from "@/actions/admin-shop";
+import { Button } from "@/components/ui/button";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 import { prisma } from "@/lib/prisma";
 
@@ -141,14 +142,14 @@ export default async function EditShopArticle({
 					/>
 				</div>
 				<div className="mt-6 flex gap-2">
-					<button type="submit" className="btn btn-primary">
+					<Button type="submit" variant="default">
 						{t("form.save")}
-					</button>
+					</Button>
 					<form action={deleteShopArticle}>
 						<input type="hidden" name="id" value={String(pkg.id)} />
-						<button type="submit" className="btn btn-danger">
+						<Button type="submit" variant="destructive">
 							{t("form.deletePackage")}
-						</button>
+						</Button>
 					</form>
 				</div>
 			</form>

src/app/admin/shop/new/page.tsx

@@ -3,6 +3,7 @@ import Link from "next/link";
 import { redirect } from "next/navigation";
 import { getTranslations } from "next-intl/server";
 import { createShopArticle } from "@/actions/admin-shop";
+import { Button } from "@/components/ui/button";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
 
 export default async function NewShopArticle() {
@@ -111,9 +112,9 @@ export default async function NewShopArticle() {
 					/>
 				</div>
 				<div className="mt-6 text-right">
-					<button type="submit" className="btn btn-primary">
+					<Button type="submit" variant="default">
 						{t("form.create")}
-					</button>
+					</Button>
 				</div>
 			</form>
 		</main>

src/app/admin/shop/page.tsx

@@ -3,9 +3,11 @@ import { redirect } from "next/navigation";
 import { getTranslations } from "next-intl/server";
 import { AdminSimplePager } from "@/components/admin/admin-simple-pager";
 import { StatusCard } from "@/components/admin/dashboard";
+import { Button } from "@/components/ui/button";
 import { CurrencyIcon } from "@/components/shared/currency-icon";
 import { calcPagination, parseListParams } from "@/lib/admin-helpers";
 import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
+import { formatDate } from "@/lib/format-date";
 import { prisma } from "@/lib/prisma";
 
 export const dynamic = "force-dynamic";
@@ -116,9 +118,11 @@ export default async function AdminShop({
 				</div>
 			) : null}
 			<div className="flex items-center justify-end gap-4">
-				<Link href="/admin/shop/new" className="btn btn-primary">
-					{t("newPackage")}
-				</Link>
+				<Button variant="default" asChild>
+					<Link href="/admin/shop/new">
+						{t("newPackage")}
+					</Link>
+				</Button>
 			</div>
 
 			<div className="grid grid-cols-[repeat(auto-fit,minmax(180px,1fr))] gap-3.5 mb-6">
@@ -235,9 +239,7 @@ export default async function AdminShop({
 												)}
 											</td>
 											<td className="muted">
-												{o.createdAt
-													? o.createdAt.toISOString().slice(0, 10)
-													: "—"}
+												{formatDate(o.createdAt, "date")}
 											</td>
 										</tr>
 									);