Import ESP_UniClock (upstream 1189810)

Vendored from https://github.com/gpeter62/ESP_UniClock: the sketch
source, the web UI and the libraries the ESP8266 build needs, unpacked
from the bundled zips. Adds a PlatformIO project for the ESP-12. The
source is unchanged; local changes follow as separate commits.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

firmware/uniclock/lib/ESPAsyncWiFiManager/examples/AutoConnectWithFeedbackLED/AutoConnectWithFeedbackLED.ino

@@ -0,0 +1,74 @@
+#if defined(ESP8266)
+#include <ESP8266WiFi.h>          //https://github.com/esp8266/Arduino
+#else
+#include <WiFi.h>
+#endif
+
+//needed for library
+#include <ESPAsyncWebServer.h>
+#include <ESPAsyncWiFiManager.h>         //https://github.com/tzapu/WiFiManager
+
+//for LED status
+#include <Ticker.h>
+Ticker ticker;
+
+void tick()
+{
+  //toggle state
+  int state = digitalRead(BUILTIN_LED);  // get the current state of GPIO1 pin
+  digitalWrite(BUILTIN_LED, !state);     // set pin to the opposite state
+}
+
+//gets called when WiFiManager enters configuration mode
+void configModeCallback (AsyncWiFiManager *myWiFiManager) {
+  Serial.println("Entered config mode");
+  Serial.println(WiFi.softAPIP());
+  //if you used auto generated SSID, print it
+  Serial.println(myWiFiManager->getConfigPortalSSID());
+  //entered config mode, make led toggle faster
+  ticker.attach(0.2, tick);
+}
+
+AsyncWebServer server(80);
+DNSServer dns;
+
+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(115200);
+
+  //set led pin as output
+  pinMode(BUILTIN_LED, OUTPUT);
+  // start ticker with 0.5 because we start in AP mode and try to connect
+  ticker.attach(0.6, tick);
+
+  //WiFiManager
+  //Local intialization. Once its business is done, there is no need to keep it around
+  AsyncWiFiManager wifiManager(&server,&dns);
+  //reset settings - for testing
+  //wifiManager.resetSettings();
+
+  //set callback that gets called when connecting to previous WiFi fails, and enters Access Point mode
+  wifiManager.setAPCallback(configModeCallback);
+
+  //fetches ssid and pass and tries to connect
+  //if it does not connect it starts an access point with the specified name
+  //here  "AutoConnectAP"
+  //and goes into a blocking loop awaiting configuration
+  if (!wifiManager.autoConnect()) {
+    Serial.println("failed to connect and hit timeout");
+    //reset and try again, or maybe put it to deep sleep
+    ESP.reset();
+    delay(1000);
+  }
+
+  //if you get here you have connected to the WiFi
+  Serial.println("connected...yeey :)");
+  ticker.detach();
+  //keep LED on
+  digitalWrite(BUILTIN_LED, LOW);
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+}