Remove obsolete implementation and simplify project structure

src/anyimage/menu.py

@@ -0,0 +1,76 @@
+import bpy
+
+from .operators.image import is_image_empty
+
+
+class AnyImageImageMenu(bpy.types.Menu):
+    bl_idname = "ANYIMAGE_MT_image_context"
+    bl_label = "AnyImage"
+
+    def draw(self, _context):
+        from .runtime import runtime
+        from .properties import required_models_ready
+
+        layout = self.layout
+        layout.operator_context = "INVOKE_DEFAULT"
+        layout.operator(
+            "anyimage.activate_balloon_tool",
+            text="Balloon Lasso Tool",
+            icon="MOD_SKIN",
+        )
+        layout.separator()
+        environment_ready = runtime.environment_ready()
+        if not environment_ready:
+            layout.operator(
+                "anyimage.install_environment",
+                text="Install Environment",
+                icon="IMPORT",
+            )
+            layout.operator(
+                "anyimage.install_environment_mirror",
+                text="Install Environment (Mirror)",
+                icon="IMPORT",
+            )
+        models_ready = required_models_ready()
+        if environment_ready and not models_ready:
+            layout.operator(
+                "anyimage.download_required_models",
+                text="Download Required Models",
+                icon="IMPORT",
+            )
+        features_ready = environment_ready and models_ready
+        if not features_ready:
+            layout.separator()
+        depth_plane_row = layout.row()
+        depth_plane_row.enabled = features_ready
+        depth_plane_row.operator(
+            "anyimage.convert_to_depth_plane",
+            text="Convert to Depth Plane",
+            icon="MOD_DISPLACE",
+        )
+        surface_row = layout.row()
+        surface_row.enabled = features_ready
+        surface_row.operator(
+            "anyimage.convert_to_surface",
+            text="Convert to Surface",
+            icon="MESH_GRID",
+        )
+        layout.separator()
+        background_row = layout.row()
+        background_row.enabled = features_ready
+        background_row.operator(
+            "anyimage.remove_image_background",
+            text="Remove Background",
+            icon="IMAGE_ALPHA",
+        )
+
+
+def draw_image_context_menu(self, context):
+    if not is_image_empty(context.object):
+        return
+    self.layout.separator()
+    self.layout.menu(
+        AnyImageImageMenu.bl_idname,
+        text="AnyImage",
+        icon="PLUGIN",
+    )