Start: Add check for uv

Uv is the definitive package installation tool for Python, so add
support to check for it via the start script.

Signed-off-by: kingbri <8082010+kingbri1@users.noreply.github.com>

start.bat

@@ -5,13 +5,27 @@
 
 cd "%~dp0"
 
+where uv >nul 2>&1
+if %errorlevel% equ 0 (
+    echo "HAS UV"
+    set HAS_UV=1
+) else (
+    set HAS_UV=0
+)
+
 :: Don't create a venv if a conda environment is active
 if exist "%CONDA_PREFIX%" (
     echo It looks like you're in a conda environment. Skipping venv check.
 ) else (
     if not exist "venv\" (
         echo Venv doesn't exist! Creating one for you.
-        python -m venv venv
+
+        if %HAS_UV% equ 1 (
+            echo "It looks like you're using uv. Running appropriate commands."
+            uv venv venv -p 3.12
+        ) else (
+            python -m venv venv
+        )
 
         if exist "start_options.json" (
             echo Removing old start_options.json