feat: manufacturer service with list, get, create

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/server/services/manufacturer.service.ts

@@ -0,0 +1,42 @@
+import { asc, eq } from "drizzle-orm";
+import { db as prodDb } from "../../db/index.ts";
+import { manufacturers } from "../../db/schema.ts";
+
+type Db = typeof prodDb;
+
+export type CreateManufacturerInput = {
+	name: string;
+	slug: string;
+	website: string;
+	tier?: number;
+	country?: string;
+};
+
+export async function listManufacturers(db: Db = prodDb) {
+	return db.select().from(manufacturers).orderBy(asc(manufacturers.name));
+}
+
+export async function getManufacturerBySlug(db: Db = prodDb, slug: string) {
+	const [row] = await db
+		.select()
+		.from(manufacturers)
+		.where(eq(manufacturers.slug, slug));
+	return row ?? null;
+}
+
+export async function createManufacturer(
+	db: Db = prodDb,
+	data: CreateManufacturerInput,
+) {
+	const [row] = await db
+		.insert(manufacturers)
+		.values({
+			name: data.name,
+			slug: data.slug,
+			website: data.website,
+			tier: data.tier ?? 1,
+			country: data.country ?? null,
+		})
+		.returning();
+	return row!;
+}