feat(09-01): add classification column to setupItems with service layer and tests

- Add classification text column (default 'base') to setupItems schema
- Add classificationSchema and updateClassificationSchema Zod validators
- Add UpdateClassification type inferred from Zod schema
- Implement updateItemClassification service function
- Modify getSetupWithItems to return classification field
- Modify syncSetupItems to preserve classifications across re-sync
- Add tests for classification CRUD, preservation, and cross-setup independence
- Generate and apply Drizzle migration

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

src/shared/schemas.ts

@@ -73,3 +73,10 @@ export const updateSetupSchema = z.object({
 export const syncSetupItemsSchema = z.object({
 	itemIds: z.array(z.number().int().positive()),
 });
+
+// Classification schemas
+export const classificationSchema = z.enum(["base", "worn", "consumable"]);
+
+export const updateClassificationSchema = z.object({
+	classification: classificationSchema,
+});