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).

README.md

@@ -23,12 +23,14 @@ Based on [HATS-Installer-Payload](https://github.com/sthetix/HATS-Installer-Payl
 For detailed information about the installation process, see:
 - **[INSTALLATION_PROCESS.md](INSTALLATION_PROCESS.md)** - Complete step-by-step breakdown of everything checked and done during installation/update
 - **[DEBUG_INI.md](DEBUG_INI.md)** - Optional `sd:/config/omninx/debug.ini` parameters to skip install steps (for testing)
+- **[PRESERVE_INI.md](PRESERVE_INI.md)** - Optional `sd:/config/omninx/preserve.ini` to skip deleting chosen paths in **update** mode
 
 ## Installation Modes
 
 ### Update Mode (OmniNX Detected)
 - Detected when version marker files (`1.0.0s`, `1.0.0l`, or `1.0.0oc`) are found
 - Performs selective deletion of specific directories/files
+- Optional **`sd:/config/omninx/preserve.ini`**: user-listed `sd:/…` paths (with `=1`) are excluded from that cleanup (see [PRESERVE_INI.md](PRESERVE_INI.md))
 - Preserves user data, savegames, and installed games
 - Updates only necessary CFW components