Fix TypeScript errors and implement furniture import ID integrity with 18+ age verification

- Add termsAccepted and ageVerified columns to User table
- Update register schema with new boolean fields
- Fix register form age verification checkbox (th -> t)
- Fix furni-import spriteId declaration order
- Fix batch route variable naming (id -> spriteId)
- Fix catalog-audit import path and ensure correct types
- Hardened import with per-item id conflict checks
- Added audit option for FurnitureData.json spriteId conflicts
- Updated tagline to include Leeftijdsvereiste: 18+

src/lib/services/furni-import.test.ts

@@ -11,6 +11,7 @@ vi.mock("@/lib/services/furni-data", () => ({
 	appendFurniEntry: vi.fn(),
 	buildFurniEntry: vi.fn(),
 	removeFurniEntry: vi.fn(),
+	findFurniDataIdConflict: vi.fn(),
 }));
 
 vi.mock("@/lib/services/habbo-furnidata-cache", () => ({