Preserve.ini for update cleanup, Hekate UI strings, docs

- Load sd:/config/omninx/preserve.ini during update mode cleanup to skip
  delete paths that overlap user-preserved prefixes (heap-backed path list).
- Document preserve.ini in PRESERVE_INI.md, README, and INSTALLATION_PROCESS.
- Prefer Hekate wording in main.c user messages for bootloader launch/errors.
- Extend update deletion list for exefs_patches (audio_mastervolume, SaltyNX_Fixes, logo).

source/deletion_lists_update.h

@@ -10,14 +10,16 @@ static const char* atmosphere_dirs_to_delete[] = {
     "sd:/atmosphere/config",
     "sd:/atmosphere/crash_reports",
     "sd:/atmosphere/erpt_reports",
+    "sd:/atmosphere/exefs_patches/audio_mastervolume",
     "sd:/atmosphere/exefs_patches/CrunchPatch",
+    "sd:/atmosphere/exefs_patches/SaltyNX_Fixes",
     "sd:/atmosphere/exefs_patches/Crunchyroll Patch 1.10.0",
     "sd:/atmosphere/exefs_patches/bluetooth_patches",
     "sd:/atmosphere/exefs_patches/bootlogo",
     "sd:/atmosphere/exefs_patches/btm_patches",
     "sd:/atmosphere/exefs_patches/es_patches",
     "sd:/atmosphere/exefs_patches/hid_patches",
-    "sd:/atmosphere/exefs_patches/logo1",
+    "sd:/atmosphere/exefs_patches/logo",
     "sd:/atmosphere/exefs_patches/nfim_ctest",
     "sd:/atmosphere/exefs_patches/nim_ctest",
     "sd:/atmosphere/exefs_patches/nvnflinger_cmu",