Enable C++ only text generation

[mzegla]

🛠 Summary

Enabling text generation endpoints in OVMS with Python disabled.

🧪 Checklist

• Unit tests added.
• The documentation updated.
• Change follows security best practices.
  ``

[Copilot]

Pull Request Overview

This PR enables C++-only text generation endpoints by conditionally disabling Python-dependent code and replacing references to the old text processor with a new template processor. Key changes include:

• Adding preprocessor guards (#if (PYTHON_DISABLE == 0)) around Python interpreter initialization and related includes in tests and production code.
• Replacing references and include paths for the text processor with those for text utilities and the new PyJinjaTemplateProcessor.
• Introducing debug output (via std::cout) in the ContinuousBatchingServableInitializer code.

Reviewed Changes

Copilot reviewed 22 out of 24 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/test/llm/llmnode_test.cpp	Wrapped Python initialization and updated include for text processing utilities.
src/mediapipe_internal/mediapipegraphexecutor.hpp	Moved LLM session side packet setting outside Python guard.
src/mediapipe_internal/mediapipegraphdefinition.cpp	Adjusted Python resource guard closing for node initialization.
src/llm/visual_language_model/legacy/servable_initializer.cpp	Replaced loadTextProcessor with loadTemplateProcessor behind a PYTHON_DISABLE guard.
src/llm/text_utils.hpp	Updated copyright year and removed Python embedding includes.
src/llm/servable_initializer.cpp	Renamed function from loadTextProcessor to loadTemplateProcessor and added new parsing function for max model length.
src/llm/language_model/continuous_batching/servable_initializer.cpp	Added extensive debug logging using std::cout.
Other files	Updated include references and conditional Python blocks to support C++-only text generation.

Files not reviewed (2)

• src/BUILD: Language not supported
• src/llm/BUILD: Language not supported

[Copilot]

Debug output using std::cout appears in production code; consider replacing these statements with the project's logging framework (e.g., SPDLOG) for consistency and better control.

Suggested change

	std::cout << "Parsed models path: " << parsedModelsPath << std::endl;
	if (!status.ok()) {
	return status;
	}
	auto properties = std::static_pointer_cast<ContinuousBatchingServableProperties>(servable->getProperties());
	std::cout << "Properties casted successfully." << std::endl;
	properties->modelsPath = parsedModelsPath;
	std::cout << "Models path set to: " << properties->modelsPath << std::endl;
	properties->schedulerConfig.max_num_batched_tokens = nodeOptions.max_num_batched_tokens();
	std::cout << "Scheduler max_num_batched_tokens set to: " << properties->schedulerConfig.max_num_batched_tokens << std::endl;
	properties->schedulerConfig.cache_size = nodeOptions.cache_size();
	std::cout << "Scheduler cache_size set to: " << properties->schedulerConfig.cache_size << std::endl;
	properties->schedulerConfig.dynamic_split_fuse = nodeOptions.dynamic_split_fuse();
	std::cout << "Scheduler dynamic_split_fuse set to: " << properties->schedulerConfig.dynamic_split_fuse << std::endl;
	properties->schedulerConfig.max_num_seqs = nodeOptions.max_num_seqs();
	std::cout << "Scheduler max_num_seqs set to: " << properties->schedulerConfig.max_num_seqs << std::endl;
	spdlog::info("Parsed models path: {}", parsedModelsPath);
	if (!status.ok()) {
	return status;
	}
	auto properties = std::static_pointer_cast<ContinuousBatchingServableProperties>(servable->getProperties());
	spdlog::info("Properties casted successfully.");
	properties->modelsPath = parsedModelsPath;
	spdlog::info("Models path set to: {}", properties->modelsPath);
	properties->schedulerConfig.max_num_batched_tokens = nodeOptions.max_num_batched_tokens();
	spdlog::info("Scheduler max_num_batched_tokens set to: {}", properties->schedulerConfig.max_num_batched_tokens);
	properties->schedulerConfig.cache_size = nodeOptions.cache_size();
	spdlog::info("Scheduler cache_size set to: {}", properties->schedulerConfig.cache_size);
	properties->schedulerConfig.dynamic_split_fuse = nodeOptions.dynamic_split_fuse();
	spdlog::info("Scheduler dynamic_split_fuse set to: {}", properties->schedulerConfig.dynamic_split_fuse);
	properties->schedulerConfig.max_num_seqs = nodeOptions.max_num_seqs();
	spdlog::info("Scheduler max_num_seqs set to: {}", properties->schedulerConfig.max_num_seqs);