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/main.c

@@ -145,7 +145,7 @@ static int launch_payload(const char *path) {
     if (sd_mount()) {
         FIL fp;
         if (f_open(&fp, path, FA_READ)) {
-            gfx_printf("Payload nicht gefunden: %s\n", path);
+            gfx_printf("Hekate nicht gefunden: %s\n", path);
             return 1;
         }
 
@@ -301,7 +301,7 @@ void ipl_main(void) {
         if (file_exists(PAYLOAD_PATH)) {
             gfx_printf("\n");
             set_color(COLOR_CYAN);
-            gfx_printf("Payload wird gestartet...\n");
+            gfx_printf("Hekate wird gestartet...\n");
             set_color(COLOR_WHITE);
             msleep(500);
             launch_payload(PAYLOAD_PATH);
@@ -721,16 +721,16 @@ void ipl_main(void) {
     
     gfx_printf("\n");
     set_color(COLOR_CYAN);
-    gfx_printf("Payload wird gestartet...\n");
+    gfx_printf("Hekate wird gestartet...\n");
     set_color(COLOR_WHITE);
     msleep(500); // Brief delay before launch
     
     if (file_exists(PAYLOAD_PATH)) {
         launch_payload(PAYLOAD_PATH);
     } else {
-        // Payload not found, show error
+        // Hekate (update.bin) not found, show error
         set_color(COLOR_RED);
-        gfx_printf("\nFEHLER: Payload nicht gefunden!\n");
+        gfx_printf("\nFEHLER: Hekate nicht gefunden!\n");
         gfx_printf("Pfad: %s\n", PAYLOAD_PATH);
         set_color(COLOR_WHITE);
         gfx_printf("\nDruecke A oder Power zum Neustart...\n");