Add delay setting to Sub-GHz playlist

Related to DarkFlippers#834

---

For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/DarkFlippers/unleashed-firmware/issues/834?shareId=XXXX-XXXX-XXXX-XXXX).

applications/main/clock_app/resources/subplaylist/example_playlist.txt

@@ -1,5 +1,6 @@
 # Example file, it will not work, you need to add paths to your files!
+delay: 60000
 sub: /ext/subghz/Vehicles/Tesla/Tesla_charge_AM270.sub
 sub: /ext/subghz/Vehicles/Tesla/Tesla_charge_AM650.sub
 sub: /ext/subghz/Test1.sub
-sub: /ext/subghz/Test2.sub
+sub: /ext/subghz/Test2.sub

applications/main/subghz/subghz_cli.c

@@ -586,6 +586,7 @@ void subghz_cli_command_tx_from_file(Cli* cli, FuriString* args, void* context)
     furi_string_set(file_name, EXT_PATH("subghz/test.sub"));
     uint32_t repeat = 10;
     uint32_t device_ind = 0; // 0 - CC1101_INT, 1 - CC1101_EXT
+    uint32_t delay = 0; // Delay in milliseconds
 
     Storage* storage = furi_record_open(RECORD_STORAGE);
     FlipperFormat* fff_data_file = flipper_format_file_alloc(storage);
@@ -756,6 +757,11 @@ void subghz_cli_command_tx_from_file(Cli* cli, FuriString* args, void* context)
             flipper_format_delete_key(fff_data_file, "Repeat");
         }
 
+        // Load delay
+        if(!flipper_format_read_uint32(fff_data_file, "Delay", &delay, 1)) {
+            delay = 0; // Default to 0 if delay is not specified
+        }
+
         if(is_init_protocol) {
             check_file = true;
         } else {
@@ -801,6 +807,11 @@ void subghz_cli_command_tx_from_file(Cli* cli, FuriString* args, void* context)
                     subghz_transmitter_deserialize(transmitter, fff_data_raw);
             }
 
+            // Apply delay if specified
+            if(delay > 0 && repeat) {
+                furi_delay_ms(delay);
+            }
+
         } while(!cli_cmd_interrupt_received(cli) &&
                 (repeat && !strcmp(furi_string_get_cstr(temp_str), "RAW")));