feat: Add Camera Settings dialog for UVC controls and Qt parameters

- Implemented CameraSettingsDialog to manage UVC and Qt camera controls.
- Integrated UVC parameter sliders and auto controls for brightness, contrast, saturation, hue, sharpness, gamma, white balance, backlight compensation, and exposure.
- Added functionality to change white balance and exposure settings via Qt controls.
- Updated MainWindow to open CameraSettingsDialog and manage UVC controller lifecycle.
- Enhanced AppMenuBar to include a Camera Settings option.
- Created tests for UVC controller abstraction layer and parameter info.
- Documented camera specifications and supported features in new markdown files.

app/camera/uvc/__init__.py

@@ -0,0 +1,48 @@
+"""UVC camera controls — platform-aware factory."""
+
+from __future__ import annotations
+
+import logging
+import platform
+
+from app.camera.uvc.base import UvcControllerBase, UvcParam, UvcParamInfo
+
+logger = logging.getLogger(__name__)
+
+
+def make_uvc_controller(device_name: str) -> UvcControllerBase:
+    """
+    Return the best available UVC controller for the current platform.
+
+    Falls back to NullUvcController if the required native library is absent.
+    """
+    system = platform.system()
+
+    if system == "Windows":
+        try:
+            from app.camera.uvc.windows import WindowsUvcController  # noqa: PLC0415
+            ctrl = WindowsUvcController(device_name)
+            logger.info("UVC: Windows controller (duvc-ctl) loaded for '%s'", device_name)
+            return ctrl
+        except ImportError:
+            logger.warning(
+                "UVC: duvc-ctl not installed — install with: pip install duvc-ctl"
+            )
+    elif system == "Darwin":
+        try:
+            from app.camera.uvc.macos import MacUvcController  # noqa: PLC0415
+            ctrl = MacUvcController(device_name)
+            logger.info("UVC: macOS controller loaded for '%s'", device_name)
+            return ctrl
+        except ImportError:
+            logger.warning(
+                "UVC: pyuvc not installed — UVC controls unavailable on macOS"
+            )
+    else:
+        logger.warning("UVC: platform '%s' not supported — controls unavailable", system)
+
+    from app.camera.uvc.stub import NullUvcController  # noqa: PLC0415
+    return NullUvcController()
+
+
+__all__ = ["make_uvc_controller", "UvcControllerBase", "UvcParam", "UvcParamInfo"]