fix(network): set ethernet hostname before startup

src/helpers/ethernet/ch390/CH390Config.h

@@ -14,29 +14,13 @@ static inline bool beginConfiguredCH390(const char* hostname = nullptr) {
   config.spi_sck_gpio = ETH_SCLK_PIN;
   config.spi_cs_gpio = ETH_CS_PIN;
   config.int_gpio = ETH_INT_PIN;
-  if (!CH390.begin(config)) return false;
-
   if (hostname && hostname[0] != '\0') {
-#if !(defined(ETHERNET_STATIC_IP) && defined(ETHERNET_STATIC_GATEWAY) && defined(ETHERNET_STATIC_SUBNET))
-    // ESP32-CH390 creates and starts its esp_netif inside begin(), so its
-    // setHostname() cannot be called earlier. Stop the just-created DHCP
-    // client, apply the name to that exact Ethernet netif, then start a fresh
-    // DHCP transaction. This prevents a fast wired link from retaining the
-    // ESP-IDF default hostname for its initial lease.
-    const bool dhcp_stopped = CH390.disableDHCP();
-    const bool hostname_set = CH390.setHostname(hostname);
-    const bool dhcp_started = CH390.enableDHCP();
-    if (!dhcp_stopped || !hostname_set || !dhcp_started) {
-      Serial.printf("Network: could not fully apply Ethernet hostname %s\n",
-                    hostname);
-    }
-#else
     if (!CH390.setHostname(hostname)) {
-      Serial.printf("Network: could not apply Ethernet hostname %s\n",
-                    hostname);
+      Serial.printf("Network: invalid Ethernet hostname %s\n", hostname);
+      return false;
     }
-#endif
   }
+  if (!CH390.begin(config)) return false;
 
 #if defined(ETHERNET_STATIC_IP) && defined(ETHERNET_STATIC_GATEWAY) && defined(ETHERNET_STATIC_SUBNET)
   IPAddress ip(ETHERNET_STATIC_IP);