Add display refresh rate detection and display

- Added get_monitor_refresh_rates() function in monitor_names.py using Windows ctypes/DEVMODE to detect monitor refresh rates
- Updated DisplayInfo dataclass and Pydantic schema to include refresh_rate field (in Hz)
- Modified get_available_displays() to detect and include refresh rates (defaults to 60Hz on non-Windows or if detection fails)
- Added refresh rate display in Web UI between Resolution and Position
- Added translations for refresh rate label (displays.refresh_rate) in English and Russian locales
- Cross-platform compatible: gracefully falls back to 60Hz default on non-Windows systems

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

server/src/wled_controller/core/screen_capture.py

@@ -7,7 +7,7 @@ import mss
 import numpy as np
 from PIL import Image
 
-from wled_controller.utils import get_logger, get_monitor_names
+from wled_controller.utils import get_logger, get_monitor_names, get_monitor_refresh_rates
 
 logger = get_logger(__name__)
 
@@ -23,6 +23,7 @@ class DisplayInfo:
     x: int
     y: int
     is_primary: bool
+    refresh_rate: int  # in Hz
 
 
 @dataclass
@@ -58,6 +59,9 @@ def get_available_displays() -> List[DisplayInfo]:
         # Get friendly monitor names (Windows only, falls back to generic names)
         monitor_names = get_monitor_names()
 
+        # Get monitor refresh rates (Windows only, falls back to 60Hz)
+        refresh_rates = get_monitor_refresh_rates()
+
         with mss.mss() as sct:
             displays = []
 
@@ -66,6 +70,9 @@ def get_available_displays() -> List[DisplayInfo]:
                 # Use friendly name from WMI if available, otherwise generic name
                 friendly_name = monitor_names.get(idx, f"Display {idx}")
 
+                # Use detected refresh rate or default to 60Hz
+                refresh_rate = refresh_rates.get(idx, 60)
+
                 display_info = DisplayInfo(
                     index=idx,
                     name=friendly_name,
@@ -74,6 +81,7 @@ def get_available_displays() -> List[DisplayInfo]:
                     x=monitor["left"],
                     y=monitor["top"],
                     is_primary=(idx == 0),
+                    refresh_rate=refresh_rate,
                 )
                 displays.append(display_info)