Add high-resolution ASCII diagram converter for academic presentations

feat: Implement 3-tier fallback generation mechanism in MedicalAdviceGenerator

Update tests/test_multilevel_fallback_validation.py

Add end-to-end pipeline test script for OnCall.ai

refactor: improve multilayer logic in llm_clients to to enhance functionality and improve performance based on medical or unmedical issues

Re-check multilevel fallback validation test suite for OnCall.ai

feat(user_prompt): Enhance Medical Query Processing Pipeline

feat(user_prompt): update UserPromptProcessor to integrate Llama3-Med42-70B and enhance query validation; add unit tests for condition extraction and matching mechanisms

refactor(deduplication): change deduplication logic from distance-based to exact text matching

feat(retrieval) 1st MVP: enhance search logging and deduplication logic with distance threshold

refactor(data_processing): enhance chunking and embedding generation

Add comprehensive tests for chunk quality analysis and embedding validation

Add requirements.txt for test dependencies

Remove obsolete embedding and index files; add comprehensive embedding test analysis and validation suite

feat(data_processing): Implement token length control with semantic preservation

refactor(data_processing): optimize chunking strategy with token-based approach

feat(data-processing): implement data processing pipeline with embeddings