refactor(sonar): make read-only global tables const (cpp:S5421)

Mutable global state (flags, timers, singletons) is left as is.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

utilities/Logs.cpp

@@ -21,7 +21,7 @@ std::ofstream errors; // lista błędów "errors.txt", zawsze działa
 std::ofstream comms; // lista komunikatow "comms.txt", można go wyłączyć
 char logbuffer[ 256 ];
 
-char endstring[10] = "\n";
+char const endstring[10] = "\n";
 
 std::deque<std::string> log_scrollback;
 

utilities/uart.cpp

@@ -10,7 +10,7 @@
 #include "simulation/simulationtime.h"
 #include "application/application.h"
 
-const char* uart_baudrates_list[] = {
+const char* const uart_baudrates_list[] = {
     "300",
     "1200",
     "2400",

utilities/uart.h

@@ -3,7 +3,7 @@
 #include <libserialport.h>
 #include "input/command.h"
 
-extern const char* uart_baudrates_list[];
+extern const char* const uart_baudrates_list[];
 extern const size_t uart_baudrates_list_num;
 
 class uart_status {

utilities/utilities.cpp

@@ -421,7 +421,7 @@ void win1250_to_utf32(std::string const &Text, std::u32string &Output)
 }
 
 // Ra: tymczasowe rozwiązanie kwestii zagranicznych (czeskich) napisów
-char charsetconversiontable[] = "E?,?\"_++?%S<STZZ?`'\"\".--??s>stzz"
+char const charsetconversiontable[] = "E?,?\"_++?%S<STZZ?`'\"\".--??s>stzz"
                                 " ^^L$A|S^CS<--RZo±,l'uP.,as>L\"lz"
                                 "RAAAALCCCEEEEIIDDNNOOOOxRUUUUYTB"
                                 "raaaalccceeeeiiddnnoooo-ruuuuyt?";