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

.gitea/workflows/docs.yml

@@ -0,0 +1,51 @@
+name: Deploy Docs
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "docs/**"
+      - ".gitea/workflows/docs.yml"
+      - ".gitea/workflows/sync-silo-docs.yml"
+
+jobs:
+  build-and-deploy:
+    runs-on: docs
+    steps:
+      - name: Checkout
+        run: |
+          REPO_URL="http://gitea:3000/kindred/create.git"
+          if [ -d .git ]; then
+            git fetch "$REPO_URL" main
+            git checkout -f FETCH_HEAD
+          else
+            git clone --depth 1 --branch main "$REPO_URL" .
+          fi
+
+      - name: Install mdBook
+        run: |
+          if ! command -v mdbook &>/dev/null; then
+            MDBOOK_VERSION="v0.5.2"
+            wget -q -O mdbook.tar.gz "https://github.com/rust-lang/mdBook/releases/download/${MDBOOK_VERSION}/mdbook-${MDBOOK_VERSION}-x86_64-unknown-linux-musl.tar.gz"
+            tar -xzf mdbook.tar.gz -C /usr/local/bin
+            rm mdbook.tar.gz
+          fi
+
+      - name: Fetch Silo server docs
+        run: |
+          rm -rf /tmp/silo
+          git clone --depth 1 http://gitea:3000/kindred/silo.git /tmp/silo
+          mkdir -p docs/src/silo-server
+          cp /tmp/silo/docs/*.md docs/src/silo-server/
+          cp /tmp/silo/README.md docs/src/silo-server/overview.md
+          cp /tmp/silo/ROADMAP.md docs/src/silo-server/ROADMAP.md 2>/dev/null || true
+          cp /tmp/silo/frontend-spec.md docs/src/silo-server/frontend-spec.md 2>/dev/null || true
+          rm -rf /tmp/silo
+
+      - name: Build mdBook
+        run: mdbook build docs/
+
+      - name: Deploy
+        run: |
+          rm -rf /opt/git/docs/book/*
+          cp -r docs/book/* /opt/git/docs/book/