Clean install: use normal switch copy, not .offload-aware

- update_mode_install(variant, offload_aware_switch): true = update (preserve .offload), false = clean
- Update path calls with true; clean_mode_install calls with false so switch/ is copied normally on fresh install

Made-with: Cursor

source/install_clean.c

@@ -107,9 +107,9 @@ int clean_mode_restore(void) {
     return res;
 }
 
-// Clean mode: Install files (reuse update mode install)
+// Clean mode: Install files (reuse update copy logic, but normal switch copy – no .offload preservation)
 int clean_mode_install(omninx_variant_t variant) {
-    return update_mode_install(variant);
+    return update_mode_install(variant, false);
 }
 
 // Remove other staging directories (OmniNX Standard/Light/OC) that exist on SD