refactor: replace Prisma ORM runtime with Drizzle ORM facade

- Replace Prisma client runtime with Drizzle ORM (zero Prisma engine/query engine in production)
- Add Prisma-compatible facade (@/lib/prisma-facade.ts) backed by Drizzle for backwards compatibility
- Runtime queries route through Drizzle ORM; @prisma/client is now devDependency (types only)
- Remove @prisma/adapter-mariadb dependency; delete prisma-pool.ts and types/prisma.ts
- New Drizzle schema layer: src/db/schema.ts (176 tables) and src/lib/db.ts (connection)
- Update README documenting the dual-layer ORM architecture
- Restore src/generated/ gitignore (build artifact for local type generation)
- 0 TypeScript errors, 583 tests passing

The facade intentionally uses `any` types to match the Prisma Client API surface,
allowing existing code to run unmodified while routing queries through Drizzle at runtime.

src/app/admin/tickets/page.tsx

@@ -2,7 +2,6 @@ import { redirect } from "next/navigation";
 import { getTranslations } from "next-intl/server";
 import { StatusCard } from "@/components/admin/dashboard";
 import { TicketQueueBanner } from "@/components/admin/ticket-queue-banner";
-import type { Prisma } from "@/generated/prisma/client";
 import { fetchTicketQueueOpenCounts } from "@/lib/admin/ticket-queue-counts";
 import { calcPagination, parseListParams } from "@/lib/admin-helpers";
 import { formatDate } from "@/lib/format-date";
@@ -25,7 +24,7 @@ export default async function AdminTicketsPage({
 	const parsed = parseListParams(new URLSearchParams(raw));
 	const statusFilter = raw.filter_status || raw.status || "active";
 
-	const conditions: Prisma.WebsiteTicketWhereInput[] = [];
+	const conditions: any[] = [];
 
 	if (statusFilter === "active") {
 		conditions.push({ status: { not: "closed" } });
@@ -47,14 +46,14 @@ export default async function AdminTicketsPage({
 		});
 	}
 
-	const where: Prisma.WebsiteTicketWhereInput =
+	const where: any =
 		conditions.length === 0
 			? {}
 			: conditions.length === 1
 				? conditions[0]
 				: { AND: conditions };
 
-	const SORT_MAP: Record<string, Prisma.WebsiteTicketOrderByWithRelationInput> =
+	const SORT_MAP: Record<string, any> =
 		{
 			subject: { subject: "asc" },
 			status: { status: "asc" },
@@ -68,7 +67,7 @@ export default async function AdminTicketsPage({
 	const orderField = Object.keys(baseOrder)[0] as keyof typeof baseOrder;
 	const orderBy = {
 		[orderField]: parsed.order,
-	} as Prisma.WebsiteTicketOrderByWithRelationInput;
+	} as any;
 
 	const [total, openCount, inProgressCount, waitingCount, closedCount, queues] =
 		await Promise.all([