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/lib/services/alert.test.ts

@@ -0,0 +1,62 @@
+import { describe, expect, it, vi, beforeEach } from "vitest";
+
+const createFn = vi.hoisted(() => vi.fn());
+const sendMailFn = vi.hoisted(() => vi.fn().mockResolvedValue(true));
+
+vi.mock("@/lib/prisma", () => ({
+	prisma: { alertLogs: { create: createFn } },
+}));
+
+vi.mock("@/lib/services/email", () => ({
+	sendMail: sendMailFn,
+}));
+
+vi.mock("@/env", () => ({
+	env: {
+		DISCORD_WEBHOOK_URL: "",
+		ALERT_EMAIL: "",
+		HOTEL_NAME: "TestHotel",
+		APP_URL: "http://localhost:3000",
+		NODE_ENV: "test",
+	},
+}));
+
+import { sendAlert } from "./alert";
+
+beforeEach(() => {
+	createFn.mockReset();
+	sendMailFn.mockReset();
+	createFn.mockResolvedValue({ id: 1 });
+});
+
+describe("sendAlert", () => {
+	it("persists an alert log entry", async () => {
+		await sendAlert({
+			type: "test",
+			severity: "warning",
+			message: "test alert",
+		});
+		expect(createFn).toHaveBeenCalledWith({
+			data: expect.objectContaining({
+				type: "test",
+				severity: "warning",
+				message: "test alert",
+				isRead: false,
+			}),
+		});
+	});
+
+	it("returns logged=true when DB write succeeds", async () => {
+		const result = await sendAlert({
+			type: "test",
+			severity: "info",
+			message: "ok",
+		});
+		expect(result.logged).toBe(true);
+	});
+
+	it("does not call sendMail when ALERT_EMAIL is unset", async () => {
+		await sendAlert({ type: "test", severity: "error", message: "m" });
+		expect(sendMailFn).not.toHaveBeenCalled();
+	});
+});