chore(testing): add unit tests and update core render/network pipelines

- add new tests:
  - test_blp_loader.cpp
  - test_dbc_loader.cpp
  - test_entity.cpp
  - test_frustum.cpp
  - test_m2_structs.cpp
  - test_opcode_table.cpp
  - test_packet.cpp
  - test_srp.cpp
  - CMakeLists.txt
- add docs and progress tracking:
  - TESTING.md
  - perf_baseline.md
- update project config/build:
  - .gitignore
  - CMakeLists.txt
  - test.sh
- core engine updates:
  - application.cpp
  - game_handler.cpp
  - world_socket.cpp
  - adt_loader.cpp
  - asset_manager.cpp
  - m2_renderer.cpp
  - post_process_pipeline.cpp
  - renderer.cpp
  - terrain_manager.cpp
  - game_screen.cpp
- add profiler header:
  - profiler.hpp

src/rendering/m2_renderer.cpp

@@ -12,6 +12,7 @@
 #include "pipeline/asset_manager.hpp"
 #include "pipeline/blp_loader.hpp"
 #include "core/logger.hpp"
+#include "core/profiler.hpp"
 #include <chrono>
 #include <cctype>
 #include <glm/gtc/matrix_transform.hpp>
@@ -1866,6 +1867,7 @@ static glm::quat interpQuat(const pipeline::M2AnimationTrack& track,
 }
 
 static void computeBoneMatrices(const M2ModelGPU& model, M2Instance& instance) {
+    ZoneScopedN("M2::computeBoneMatrices");
     size_t numBones = std::min(model.bones.size(), size_t(128));
     if (numBones == 0) return;
     instance.boneMatrices.resize(numBones);
@@ -1898,6 +1900,7 @@ static void computeBoneMatrices(const M2ModelGPU& model, M2Instance& instance) {
 }
 
 void M2Renderer::update(float deltaTime, const glm::vec3& cameraPos, const glm::mat4& viewProjection) {
+    ZoneScopedN("M2Renderer::update");
     if (spatialIndexDirty_) {
         rebuildSpatialIndex();
     }