fix: make pystray a core dependency on Windows instead of optional extra

The tray icon should always appear on Windows, not only when installed
with the [tray] extra.

INSTALLATION.md

@@ -123,7 +123,6 @@ Screen capture from inside a container requires X11 access. Uncomment `network_m
    ```bash
    pip install ".[perf]"            # DXCam, BetterCam, WGC (Windows only)
    pip install ".[notifications]"   # OS notification capture
-   pip install ".[tray]"            # System tray icon (Windows only)
    pip install ".[dev]"             # pytest, black, ruff (development)
    ```
 

build-dist.ps1

@@ -130,7 +130,7 @@ if ($LASTEXITCODE -ne 0) { throw "Failed to install pip" }
 # ── Install dependencies ──────────────────────────────────────
 
 Write-Host "[5/8] Installing dependencies..."
-$extras = "camera,notifications,tray"
+$extras = "camera,notifications"
 if (-not $SkipPerf) { $extras += ",perf" }
 
 # Install the project (pulls all deps via pyproject.toml), then remove

server/pyproject.toml

@@ -48,6 +48,8 @@ dependencies = [
     "opencv-python-headless>=4.8.0",
     "websockets>=13.0",
     "just-playback>=0.1.7",
+    "pystray>=0.19.0; sys_platform == 'win32'",
+    "Pillow>=10.4.0; sys_platform == 'win32'",
 ]
 
 [project.optional-dependencies]
@@ -80,10 +82,6 @@ perf = [
     "bettercam>=1.0.0; sys_platform == 'win32'",
     "windows-capture>=1.5.0; sys_platform == 'win32'",
 ]
-tray = [
-    "pystray>=0.19.0; sys_platform == 'win32'",
-    "Pillow>=10.4.0; sys_platform == 'win32'",
-]
 
 [project.urls]
 Homepage = "https://git.dolgolyov-family.by/alexei.dolgolyov/wled-screen-controller-mixed"