feat: add manufacturers table to schema

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

src/db/schema.ts

@@ -1,4 +1,5 @@
 import {
+	boolean,
 	doublePrecision,
 	integer,
 	pgTable,
@@ -20,6 +21,19 @@ export const users = pgTable("users", {
 	createdAt: timestamp("created_at").defaultNow().notNull(),
 });
 
+// ── Manufacturers ────────────────────────────────────────────────────
+
+export const manufacturers = pgTable("manufacturers", {
+	id: serial("id").primaryKey(),
+	name: text("name").notNull().unique(),
+	slug: text("slug").notNull().unique(),
+	website: text("website").notNull(),
+	tier: integer("tier").notNull().default(1),
+	active: boolean("active").notNull().default(true),
+	country: text("country"),
+	createdAt: timestamp("created_at").defaultNow().notNull(),
+});
+
 // ── Categories ──────────────────────────────────────────────────────
 
 export const categories = pgTable(