phase 1: copy Kindred-only files onto upstream/main (FreeCAD 1.2.0-dev)

Wholesale copy of all Kindred Create additions that don't conflict with
upstream FreeCAD code:

- kindred-icons/ (1444 Catppuccin Mocha SVG icon overrides)
- src/Mod/Create/ (Kindred Create workbench)
- src/Gui/ Kindred source files (FileOrigin, OriginManager,
  OriginSelectorWidget, CommandOrigin, BreadcrumbToolBar, EditingContext)
- src/Gui/Icons/ (Kindred branding and silo icons)
- src/Gui/PreferencePacks/KindredCreate/
- src/Gui/Stylesheets/ (KindredCreate.qss, images_dark-light/)
- package/ (rattler-build recipe)
- docs/ (architecture, guides, specifications)
- .gitea/ (CI workflows, issue templates)
- mods/silo, mods/ztools submodules
- .gitmodules (Kindred submodule URLs)
- resources/ (kindred-create.desktop, kindred-create.xml)
- banner-logo-light.png, CONTRIBUTING.md

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "src/3rdParty/OndselSolver"]
 	path = src/3rdParty/OndselSolver
-	url = https://github.com/FreeCAD/OndselSolver.git
+	url = https://git.kindred-systems.com/kindred/solver.git
 [submodule "tests/lib"]
 	path = tests/lib
 	url = https://github.com/google/googletest
@@ -10,3 +10,9 @@
 [submodule "src/Mod/AddonManager"]
 	path = src/Mod/AddonManager
 	url = https://github.com/FreeCAD/AddonManager.git
+[submodule "mods/ztools"]
+	path = mods/ztools
+	url = https://git.kindred-systems.com/forbes/ztools.git
+[submodule "mods/silo"]
+	path = mods/silo
+	url = https://git.kindred-systems.com/kindred/silo-mod.git