Added lvgl support to generate images. Made basic example, grayscale background + text displayed everytime we call /api/display/image.png

Provider/main/Kconfig.projbuild

@@ -45,6 +45,31 @@ menu "CalendarInk Network Configuration"
             The IP address to send UDP logs to via port 514. 
             If left blank, logs will be broadcast to 255.255.255.255.
 
+    choice CALENDINK_WIFI_PS_MODE
+        prompt "WiFi Power Save Mode"
+        default CALENDINK_WIFI_PS_NONE
+        help
+            Select the WiFi power save mode to balance power consumption and network stability.
+
+        config CALENDINK_WIFI_PS_NONE
+            bool "None (No power save, highest consumption)"
+
+        config CALENDINK_WIFI_PS_MIN_MODEM
+            bool "Minimum Modem (Wakes on beacon, balanced)"
+
+        config CALENDINK_WIFI_PS_MAX_MODEM
+            bool "Maximum Modem (Lowest consumption, may drop connection on strict routers)"
+    endchoice
+
+    config CALENDINK_ALLOW_LIGHT_SLEEP
+        bool "Allow Light Sleep (Tickless Idle)"
+        default n
+        help
+            If enabled, the device will heavily use light sleep to reduce power 
+            consumption. Note that this may BREAK the UART console monitor since the
+            CPU sleeps and halts the UART! Use UDP logging if you need logs
+            while light sleep is enabled.
+
 endmenu
 
 menu "Calendink Web Server"
@@ -63,4 +88,16 @@ menu "Calendink Web Server"
         help
             VFS path where the LittleFS partition is mounted.
 
+    config CALENDINK_DISPLAY_WIDTH
+        int "LVGL Display Width"
+        default 800
+        help
+            Width of the virtual LVGL display used for image generation.
+
+    config CALENDINK_DISPLAY_HEIGHT
+        int "LVGL Display Height"
+        default 480
+        help
+            Height of the virtual LVGL display used for image generation.
+
 endmenu