feat(18-05): add public profile page and setup visibility toggle

- Create public profile page at /users/$userId with avatar, name, bio, setups
- Create PublicSetupCard component for profile page setup listing
- Add isPublic toggle button on setup detail page
- Add Public badge to SetupCard in list view
- Update useSetups hook with isPublic field on interfaces

src/client/components/SetupsView.tsx

@@ -100,6 +100,7 @@ export function SetupsView() {
 							key={setup.id}
 							id={setup.id}
 							name={setup.name}
+							isPublic={setup.isPublic}
 							itemCount={setup.itemCount}
 							totalWeight={setup.totalWeight}
 							totalCost={setup.totalCost}