Fix connection string precedence issue

- Connection string values now properly override config file values
- Fixed issue where 'wsssht zeiss' wasn't working due to incorrect precedence logic
- Command line options still take highest precedence, then connection string, then config file

wssshtools/wsssht.c

@@ -185,26 +185,23 @@ int parse_args(int argc, char *argv[], wsssh_config_t *config, int *remaining_ar
             return 0;
         }
 
-        // Set values only if not already set by command line options
-        if (!config->service && service) {
+        // Set values from connection string (these take precedence over config file)
+        if (service) {
+            if (config->service) free(config->service);
             config->service = service;
-        } else {
-            free(service);
         }
 
-        if (!config->client_id && client_id) {
+        if (client_id) {
+            if (config->client_id) free(config->client_id);
             config->client_id = client_id;
-        } else {
-            free(client_id);
         }
 
-        if (!config->wssshd_host && wssshd_host) {
+        if (wssshd_host) {
+            if (config->wssshd_host) free(config->wssshd_host);
             config->wssshd_host = wssshd_host;
-        } else {
-            free(wssshd_host);
         }
 
-        if (config->wssshd_port == 9898 && wssshd_port != 9898) {
+        if (wssshd_port != 9898) {
             config->wssshd_port = wssshd_port;
         }
     }