Add Philips Hue Festavia (LCX028) (#4097)

* Create placeholder.txt

* Delete profile_library/signify/LCX028/placeholder.txt

* Create model.json

* Uploading profiles

* Update profile_library/signify/LCX028/model.json

Co-authored-by: Bram Gerritsen <bgerritsen@gmail.com>

---------

Co-authored-by: Bram Gerritsen <bgerritsen@gmail.com>

Author: phoenixxx-1

profile_library/signify/LCX028/color_temp.csv.gz

@@ -0,0 +1,15 @@
+{
+  "calculation_strategy": "lut",
+  "created_at": "2026-04-06T18:05:55Z",
+  "device_type": "light",
+  "measure_description": "Measured with utils/measure script",
+  "measure_device": "TP-Link Kasa KP115",
+  "measure_method": "script",
+  "measure_settings": {
+    "SAMPLE_COUNT": 1,
+    "SLEEP_TIME": 2,
+    "VERSION": "v1.20.11:docker"
+  },
+  "name": "Hue Festavia Outdoor White & Colour Gradient Globe String Lights, 14m",
+  "standby_power": 0.38
+}