[MEM] Enable PSRAM on Theengs Bridge v1.1 (ESP32-WROVER-IE) (#2303)

- Switch Ethernet RMII clock from GPIO16 to GPIO0 output mode,
  freeing GPIO16 for PSRAM chip select (SPICS1) on WROVER-IE
- Enable PSRAM with QIO flash mode and cache workaround flags
- Add PHY pre-power support for ETH_CLOCK_GPIO0_IN mode
- Report PSRAM status and free memory in SYS MQTT topic

Requires Theengs lib-builder update: remove LIBTIME from IRAM
cache workaround (CONFIG_SPIRAM_CACHE_LIBTIME_IN_IRAM=n) to
free ~3.5KB IRAM for the -mfix-esp32-psram-cache-issue flag.

Tested on Theengs Bridge v1.1: 4MB PSRAM detected, Ethernet
100Mbps on GPIO0, BLE scanning nominal.

Co-authored-by: Florian <1technophile@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

main/main.cpp

@@ -2848,6 +2848,10 @@ String stateMeasures() {
 #  endif
   SYSdata["freestck"] = uxTaskGetStackHighWaterMark(NULL);
   SYSdata["powermode"] = SYSConfig.powerMode;
+  if (psramFound()) {
+    SYSdata["psram"] = true;
+    SYSdata["psramfree"] = ESP.getFreePsram();
+  }
 #endif
 
   SYSdata["eth"] = ethConnected;