Add README, sunrise alarm, CCT (white/warm) support and configs

- README: WLED pull/push usage, sunrise alarm, white vs warm (CCT) section
- wled_push: --cct 0-255 for segment 0 color temperature
- wled_config: white.json, warm.json, sunrise presets; updated state/full

Made-with: Cursor

wled_config/sunrise_test_10s.json

@@ -0,0 +1,17 @@
+{
+  "on": true,
+  "tt": 100,
+  "bri": 255,
+  "mainseg": 0,
+  "nl": {
+    "on": false
+  },
+  "seg": [
+    {
+      "id": 0,
+      "on": true,
+      "fx": 0,
+      "cct": 0
+    }
+  ]
+}