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/rooms/page.tsx

@@ -1,7 +1,9 @@
+import { and, count, desc, eq, like, or } from "drizzle-orm";
 import { DoorOpen } from "lucide-react";
 import { getTranslations } from "next-intl/server";
 import { AdminPageShell } from "@/components/admin/admin-page-shell";
 import { fetchAdminList } from "@/lib/admin-list";
+import { db, Rooms } from "@/lib/db";
 import { canAccess, PERMS } from "@/lib/permissions";
 import { RoomsTable } from "./rooms-table";
 
@@ -15,33 +17,56 @@ export default async function RoomsPage({
 	const result = await fetchAdminList(
 		{
 			permission: PERMS.ROOMS_VIEW,
-			// Prisma model is `Rooms` → client accessor `rooms`.
-			// Owner is denormalized on the row (ownerId / ownerName), not a relation.
-			model: "rooms",
-			searchFields: ["name", "ownerName"],
-			select: {
-				id: true,
-				name: true,
-				ownerId: true,
-				ownerName: true,
-				state: true,
-				users: true,
-				usersMax: true,
-				description: true,
+			fetch: async ({ search, page, perPage, rawParams }) => {
+				const conditions = [];
+				if (search) {
+					const ors = [
+						like(Rooms.name, `%${search}%`),
+						like(Rooms.ownerName, `%${search}%`),
+					];
+					const asId = Number(search);
+					if (Number.isFinite(asId) && asId > 0) {
+						ors.push(eq(Rooms.id, asId));
+					}
+					conditions.push(or(...ors));
+				}
+				if (rawParams.filter_state) {
+					conditions.push(eq(Rooms.state, rawParams.filter_state));
+				}
+				const where = conditions.length > 0 ? and(...conditions) : undefined;
+				const [rows, totals] = await Promise.all([
+					db
+						.select({
+							id: Rooms.id,
+							name: Rooms.name,
+							ownerId: Rooms.ownerId,
+							ownerName: Rooms.ownerName,
+							state: Rooms.state,
+							users: Rooms.users,
+							usersMax: Rooms.usersMax,
+							description: Rooms.description,
+						})
+						.from(Rooms)
+						.where(where)
+						.orderBy(desc(Rooms.id))
+						.limit(perPage)
+						.offset((page - 1) * perPage),
+					db.select({ total: count() }).from(Rooms).where(where),
+				]);
+				return {
+					rows: rows.map((r) => ({
+						id: r.id,
+						name: r.name,
+						ownerName: r.ownerName || "—",
+						ownerId: r.ownerId ?? 0,
+						state: r.state,
+						users: r.users,
+						usersMax: r.usersMax,
+						description: r.description || "",
+					})),
+					total: totals[0]?.total ?? 0,
+				};
 			},
-			filterMap: {
-				filter_state: (v) => ({ state: v }),
-			},
-			mapRow: (r) => ({
-				id: r.id as number,
-				name: r.name as string,
-				ownerName: (r.ownerName as string) || "—",
-				ownerId: (r.ownerId as number) ?? 0,
-				state: r.state as string,
-				users: r.users as number,
-				usersMax: r.usersMax as number,
-				description: (r.description as string) || "",
-			}),
 		},
 		paramsPromise as Promise<{ locale: string }>,
 		searchParams,