fix: SSH transport - log to stderr, use-after-free, systemd scope conflict

src/shared/log.c

@@ -12,14 +12,13 @@ void log_message(LogLevel log_level, char *format, ...) {
   time_t now = time(NULL);
   struct tm *t = localtime(&now);
 
-  // Print timestamp and log level to the file
-  printf("%04d-%02d-%02d %02d:%02d:%02d [%s]: ", t->tm_year + 1900,
-         t->tm_mon + 1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec,
-         log_level_strings[log_level]);
+  fprintf(stderr, "%04d-%02d-%02d %02d:%02d:%02d [%s]: ", t->tm_year + 1900,
+          t->tm_mon + 1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec,
+          log_level_strings[log_level]);
 
   va_list args;
   va_start(args, format);
-  vprintf(format, args);
+  vfprintf(stderr, format, args);
   va_end(args);
-  printf("\n");
+  fprintf(stderr, "\n");
 }