Fix udplogger header/implementation signature mismatch and refactor logString

[Copilot]

udplogger.h declared logString(String) while the implementation used logString(const String&), causing a compile/link failure. This PR aligns both and applies the underlying refactor.

Changes

• udplogger.h: Updated logString declaration to const String& logmessage to match the implementation
• udplogger.cpp:
  • Changed logString to take const String& — avoids an unnecessary copy on every call
  • Replaced string concatenation + toCharArray with snprintf into the existing _packetBuffer — eliminates intermediate heap allocations triggered on every NTP sync (every 30s)
  • All new comments written in German

// Before
void UDPLogger::logString(String logmessage) {
    logmessage = _name + ": " + logmessage;  // heap alloc
    Serial.println(logmessage);
    logmessage.toCharArray(_packetBuffer, 100);

// After
void UDPLogger::logString(const String& logmessage) {
    snprintf(_packetBuffer, sizeof(_packetBuffer), "%s: %s", _name.c_str(), logmessage.c_str());
    Serial.println(_packetBuffer);

[techniccontroller]

@copilot Comments in the code should be in english

[Copilot]

@copilot Comments in the code should be in english

Done — comments are now in English (commit Translate code comments back to English).

[techniccontroller]

Close as contributor commits are missing in history, instead integration and fix is done in PR #91