Add FPS counter, VSync toggle, shader metadata system, and multi-pass infrastructure

- FPS counter in window title (updates every 500ms)
- F4 key toggles VSync on/off
- Shader metadata: Name and Author from comments
- iChannel metadata parsing for multi-pass support
- Base structures: ShaderBuffer, ShaderPass
- FBO/texture management functions
- Updated all 11 shaders with Name/Author metadata

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

CMakeLists.txt

@@ -22,6 +22,7 @@ set(APP_SOURCES
 # Fuentes de librerías de terceros
 set(EXTERNAL_SOURCES
     third_party/glad/src/glad.c
+    third_party/jail_audio.cpp
 )
 
 # Configuración de SDL3
@@ -35,6 +36,7 @@ add_executable(${PROJECT_NAME} ${APP_SOURCES} ${EXTERNAL_SOURCES})
 target_include_directories(${PROJECT_NAME} PUBLIC
     "${CMAKE_SOURCE_DIR}/src"
     "${CMAKE_SOURCE_DIR}/third_party/glad/include"
+    "${CMAKE_SOURCE_DIR}/third_party"
 )
 
 # Enlazar la librería SDL3