refactor: migrate globalmenu implementation to src/window/globalmenu and adjust documentation paths

docs/architecture.md

@@ -78,9 +78,9 @@ Python DBus polling is too slow, so Modus uses a C-extension at
 macOS-style menu bar in the top panel.
 
 - Apps export menus over `com.canonical.dbusmenu` DBus
-- Custom C shim (`src/globalmenu/libmenu_button_shim.c`) forces GTK apps to
+- Custom C shim (`src/window/globalmenu/libmenu_button_shim.c`) forces GTK apps to
   export menus even if they weren't designed to
-- Python daemon (`src/globalmenu/service.py`) listens for exported menus and
+- Python daemon (`src/window/globalmenu/service.py`) listens for exported menus and
   renders them as Fabric widgets in the panel
 
 ## 5. State Management & Services

docs/installation.md

@@ -45,9 +45,9 @@ If you prefer to install dependencies and compile the extensions manually:
 
 4. **Compile the Global Menu Shim:**
    ```bash
-   cd src/globalmenu
+   cd src/window/globalmenu
    gcc -shared -fPIC -O2 -o libmenu_button_shim.so libmenu_button_shim.c $(pkg-config --cflags --libs gtk+-3.0) -ldl
-   cd ../..
+   cd ../../..
    ```
 
 5. **Start Modus:**