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

src/server/services/tag.service.ts

@@ -0,0 +1,12 @@
+import { asc } from "drizzle-orm";
+import { db as prodDb } from "../../db/index.ts";
+import { tags } from "../../db/schema.ts";
+
+type Db = typeof prodDb;
+
+export async function getAllTags(db: Db = prodDb) {
+	return db
+		.select({ id: tags.id, name: tags.name })
+		.from(tags)
+		.orderBy(asc(tags.name));
+}