BIM: BIM Setup command is too broad and not very BIM-specific

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Problem description

There are several issues with the Manage > BIM Setup (`BIM_Setup`) command:

1. It's too crowded
2. It has options that bear no direct relationship to a BIM setup (background gradient, geometry color, open an new document at startup, number of backup files) and should be better left exposed on the FreeCAD preferences only.
3. The note at the bottom of the dialog adds to the crowdedness and is outdated (e.g. the Dodo workbench is no longer maintained)

I feel the number of exposed options should be greatly reduced, and more relevant options be presented instead: e.g. annotation style chooser or editor. The ability to choose or create any other relevant presets would be more useful than the wide array of choices we're presenting currently. The note at the bottom should be either removed or be less prominent.

### Full version info

```shell
OS: Ubuntu Core 22 (ubuntu:GNOME/ubuntu/wayland)
Architecture: x86_64
Version: 1.1.0dev.44123 (Git) Snap 1829
Build date: 2025/11/03 10:11:55
Build type: Release
Branch: main
Hash: 08e4191e5a750b96498d5c25c377fe228c413c97
Python 3.10.12, Qt 5.15.15, Coin 4.0.0, Vtk 9.1.0, boost 1_74, Eigen3 3.4.0, PySide 5.15.11
shiboken 5.15.11, SMESH 7.7.1.0, xerces-c 3.2.3, IfcOpenShell 0.8.2, OCC 7.7.1
Navigation Style/Orbit Style/Rotation Mode: Touchpad/Trackball/Drag at cursor
Stylesheet/Theme/QtStyle: FreeCAD.qss/FreeCAD Light/Fusion
Logical DPI/Physical DPI/Pixel Ratio: 96/159.34/1
Installed mods:
* Telemetry 1.0.2
* Reporting
* Launcher
```

### Subproject(s) affected?

BIM

### Anything else?

_No response_

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct