Honor an explicit -c config path when -s is given (#11348)

The simradio flag (-s) is the first branch of an if/else-if chain that
also handles config loading, so it short-circuits every later branch --
including the one for an explicit -c <path>. Skipping config discovery
under -s is intended, but a config path the user passed by hand is not
discovery, and it is silently ignored today.

Move the -s check after the -c branch so an explicit path is always
parsed, and skip only the implicit discovery (./config.yaml,
/etc/meshtasticd/config.yaml) when -s is given without -c.

The radio override then runs after every config source, since -c and
its ConfigDirectory entries can both set Lora.Module and -s has to win
over them. Doing it there also fixes --check and --output-yaml, which
reported the configured module rather than the simulated one because
the old override sat behind an early return.

Behaviour with a bare -s is unchanged: no YAML is loaded and the radio
is the simulator.

Co-authored-by: Jonathan Bennett <jbennett@incomsystems.biz>

src/platform/portduino/PortduinoGlue.cpp

@@ -331,9 +331,9 @@ void portduinoSetup()
     return;
 #endif
 
-    if (portduino_config.force_simradio == true) {
-        portduino_config.lora_module = use_simradio;
-    } else if (configPath != nullptr) {
+    // An explicit -c is honored even under -s: it also carries non-radio settings
+    // (EnableUDP, display, GPIO) that have to survive simulated mode.
+    if (configPath != nullptr) {
         if (loadConfig(configPath)) {
             if (!yamlOnly && !configCheck)
                 std::cout << "Using " << configPath << " as config file" << std::endl;
@@ -343,6 +343,8 @@ void portduinoSetup()
             std::cout << "Unable to use " << configPath << " as config file" << std::endl;
             exit(EXIT_FAILURE);
         }
+    } else if (portduino_config.force_simradio) {
+        // -s with no -c: the simulator brings its own defaults, so skip config discovery.
     } else if (access("config.yaml", R_OK) == 0) {
         if (loadConfig("config.yaml")) {
             if (!yamlOnly && !configCheck)
@@ -390,6 +392,12 @@ void portduinoSetup()
         }
     }
 
+    // Applied after every config source: ConfigDirectory entries can set Lora.Module
+    // too, and -s must win over all of them, including in --check / --output-yaml.
+    if (portduino_config.force_simradio) {
+        portduino_config.lora_module = use_simradio;
+    }
+
 #ifndef ARCH_PORTDUINO_WASM
     // --check wins over --output-yaml: asking for validation and getting a config dump
     // with no report at all would be the more surprising of the two outcomes.