feat(cmake): add feature flags for gRPC and JSON in CMake configuration

- Introduced preprocessor macros for feature flags in CMake, allowing conditional compilation based on the presence of gRPC and JSON features.
- Updated the agent source file list to include gRPC-dependent sources only when gRPC is enabled, enhancing modularity and maintainability.

Benefits:
- Improved flexibility in enabling/disabling features at compile time.
- Streamlined source management for better organization of gRPC-related components.

CMakeLists.txt

@@ -76,6 +76,17 @@ else()
   message(STATUS "✓ All features enabled: JSON, gRPC, AI Agent")
 endif()
 
+# Define preprocessor macros for feature flags (so #ifdef works in source code)
+if(YAZE_WITH_GRPC)
+  add_compile_definitions(YAZE_WITH_GRPC)
+endif()
+if(YAZE_WITH_JSON)
+  add_compile_definitions(YAZE_WITH_JSON)
+endif()
+if(Z3ED_AI)
+  add_compile_definitions(Z3ED_AI)
+endif()
+
 option(YAZE_SUPPRESS_WARNINGS "Suppress compiler warnings (use -v preset suffix for verbose)" ON)
 set(YAZE_TEST_ROM_PATH "${CMAKE_BINARY_DIR}/bin/zelda3.sfc" CACHE STRING "Path to test ROM file")