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/ESPAsyncWebServer/library.json

@@ -0,0 +1,37 @@
+{
+  "name":"ESP Async WebServer",
+  "description":"Asynchronous HTTP and WebSocket Server Library for ESP8266 and ESP32",
+  "keywords":"http,async,websocket,webserver",
+  "authors":
+  {
+    "name": "Hristo Gochkov",
+    "maintainer": true
+  },
+  "repository":
+  {
+    "type": "git",
+    "url": "https://github.com/me-no-dev/ESPAsyncWebServer.git"
+  },
+  "version": "1.2.3",
+  "license": "LGPL-3.0",
+  "frameworks": "arduino",
+  "platforms": ["espressif8266", "espressif32"],
+  "dependencies": [
+    {
+      "owner": "me-no-dev",
+      "name": "ESPAsyncTCP",
+      "version": "^1.2.2",
+      "platforms": "espressif8266"
+    },
+    {
+      "owner": "me-no-dev",      
+      "name": "AsyncTCP",
+      "version": "^1.1.1",
+      "platforms": "espressif32"
+    },
+    {
+      "name": "Hash",
+      "platforms": "espressif8266"
+    }
+  ]
+}