feat: add manufacturers table to schema

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

drizzle-pg/0007_steady_sasquatch.sql

@@ -0,0 +1,12 @@
+CREATE TABLE "manufacturers" (
+	"id" serial PRIMARY KEY NOT NULL,
+	"name" text NOT NULL,
+	"slug" text NOT NULL,
+	"website" text NOT NULL,
+	"tier" integer DEFAULT 1 NOT NULL,
+	"active" boolean DEFAULT true NOT NULL,
+	"country" text,
+	"created_at" timestamp DEFAULT now() NOT NULL,
+	CONSTRAINT "manufacturers_name_unique" UNIQUE("name"),
+	CONSTRAINT "manufacturers_slug_unique" UNIQUE("slug")
+);