feat(20-01): add tags table, tag service/route, register global-items route

- Create tags table in schema with id, name (unique), createdAt
- Generate migration for tags table
- Create tag.service.ts with getAllTags (id+name, alphabetical order)
- Create tags.ts route with GET / handler
- Register /api/global-items and /api/tags routes in index.ts
- Add auth skip for GET /api/tags and GET /api/global-items

drizzle-pg/0002_square_pyro.sql

@@ -0,0 +1,6 @@
+CREATE TABLE "tags" (
+	"id" serial PRIMARY KEY NOT NULL,
+	"name" text NOT NULL,
+	"created_at" timestamp DEFAULT now() NOT NULL,
+	CONSTRAINT "tags_name_unique" UNIQUE("name")
+);