feat: Add language-specific LLM preset configuration

- Add ability to configure separate provider/model/template for specific programming language
- Add UI controls for language preset configuration
- Support custom provider selection per language
- Support custom model selection per language
- Support custom template selection per language

context/CMakeLists.txt

@@ -4,6 +4,7 @@ add_library(Context STATIC
     ContextManager.hpp ContextManager.cpp
     ContentFile.hpp
     TokenUtils.hpp TokenUtils.cpp
+    ProgrammingLanguage.hpp ProgrammingLanguage.cpp
 )
 
 target_link_libraries(Context