Refine Wi-Fi, mDNS, and terminal lifecycles

- Stage disabled station profile edits without restarting the radio
- Make mDNS initialization failure-isolated and reannounce in place
- Document deferred admin actions and explicit browser disconnect
  behavior

sdkconfig.defaults

@@ -49,6 +49,20 @@ CONFIG_ESP_ENABLE_WOLFSSH=y
 # The managed component emits a generic RSA stack warning although this target disables RSA.
 CONFIG_ESP_WOLFSSL_NO_STACK_SIZE_BUILD_WARNING=y
 
+# Keep configurable hostname discovery STA-only and bounded. The responder task
+# remains internal; general mDNS metadata prefers PSRAM to protect internal heap.
+CONFIG_MDNS_MAX_INTERFACES=1
+CONFIG_MDNS_MAX_SERVICES=1
+CONFIG_MDNS_PREDEF_NETIF_STA=y
+# CONFIG_MDNS_PREDEF_NETIF_AP is not set
+# CONFIG_MDNS_PREDEF_NETIF_ETH is not set
+# CONFIG_MDNS_ENABLE_CONSOLE_CLI is not set
+# CONFIG_MDNS_ENABLE_BROWSE is not set
+# CONFIG_MDNS_MULTIPLE_INSTANCE is not set
+CONFIG_MDNS_TASK_CREATE_FROM_INTERNAL=y
+CONFIG_MDNS_MEMORY_ALLOC_SPIRAM=y
+# CONFIG_MDNS_MEMORY_ALLOC_INTERNAL is not set
+
 # Support WPA3-SAE for station profiles and the WPA2/WPA3 fallback AP.
 CONFIG_ESP_WIFI_ENABLE_WPA3_SAE=y
 CONFIG_ESP_WIFI_ENABLE_SAE_H2E=y