Rename app to Oikos (was oikos-desktop)

- Binary: oikos-desktop → Oikos
- Bundle: oikos-desktop.app → Oikos.app
- Install path: /Applications/Oikos.app
- Auto-update paths updated
- CI Linux binary renamed

.gitea/workflows/desktop.yml

@@ -37,12 +37,12 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y libgtk-3-dev libwebkit2gtk-4.1-dev
 
-      - run: CGO_ENABLED=1 go build -o build/bin/oikos-desktop .
+      - run: CGO_ENABLED=1 go build -o build/bin/Oikos .
         working-directory: cmd/desktop
 
       - run: |
           cd cmd/desktop/build/bin
-          tar czf oikos-desktop-linux-amd64.tar.gz oikos-desktop
+          tar czf oikos-desktop-linux-amd64.tar.gz Oikos
           sha256sum oikos-desktop-linux-amd64.tar.gz > oikos-desktop-linux-amd64.tar.gz.sha256
 
       - uses: actions/upload-artifact@v4