🎉 Major milestone: First complete implementation of LearnOpenGL Getting Started series in Elixir!

- Fixed fundamental coordinate system bug in mat4_look_at function
- Matrix layout now matches GLM's lookAtRH specification exactly
- Resolves camera rotation issues affecting all EAGL applications

- 7.4 Camera Class: Reusable camera object abstraction
- 7.5 Camera Exercise 1: FPS-style camera implementation
- 7.6 Camera Exercise 2: Custom LookAt matrix implementation

- Hello Window (1.1-1.2): 2 examples ✅
- Hello Triangle (2.1-2.5): 5 examples ✅
- Shaders (3.1-3.6): 6 examples ✅
- Textures (4.1-4.6): 6 examples ✅
- Transformations (5.1-5.2): 3 examples ✅
- Coordinate Systems (6.1-6.4): 4 examples ✅
- Camera (7.1-7.6): 6 examples ✅

Total: 29/29 LearnOpenGL Getting Started examples + 2 original examples = 31 total examples