refactor(editor): reorganize includes and enhance EditorManager initialization

- Moved the declaration of `AgentControlServer` to a forward declaration in the header file for better clarity and organization.
- Updated the `EditorManager` constructor to initialize the version string and popup manager context.
- Added conditional compilation for gRPC-related includes and commented out the agent control server initialization for future reference.
- Ensured consistent definition of `IMGUI_DEFINE_MATH_OPERATORS` across multiple files to prevent potential issues with ImGui usage.

Benefits:
- Improved code organization and readability.
- Enhanced maintainability by clarifying the initialization process and managing includes effectively.

test/yaze_test.cc

@@ -1,5 +1,10 @@
 #define SDL_MAIN_HANDLED
 
+// Must define before any ImGui includes
+#ifndef IMGUI_DEFINE_MATH_OPERATORS
+#define IMGUI_DEFINE_MATH_OPERATORS
+#endif
+
 #include <gtest/gtest.h>
 #include <SDL.h>
 #include <iostream>