Add Windows GUI for CAD-Documenter

- New gui.py with CustomTkinter interface
- Project create/open
- Video list management
- Process with export-only option
- Progress feedback
- Entry point: cad-doc-gui

Install GUI deps: uv pip install customtkinter

pyproject.toml

@@ -38,12 +38,16 @@ dev = [
     "ruff>=0.1.0",
     "mypy>=1.0.0",
 ]
+gui = [
+    "customtkinter>=5.2.0",
+]
 pdf = [
     "pandoc",  # For PDF generation fallback
 ]
 
 [project.scripts]
 cad-doc = "cad_documenter.cli:main"
+cad-doc-gui = "cad_documenter.gui:main"
 
 [project.urls]
 Homepage = "http://100.80.199.40:3000/Antoine/CAD-Documenter"