Fix: Add google-generativeai to requirements.txt

HuggingFace deployment was failing with:
ModuleNotFoundError: No module named 'google.generativeai'

The code imports google.generativeai but requirements.txt
had google-genai (newer package with different API).

Changed requirements.txt to use google-generativeai>=0.8.0
to match the current code implementation.

🤖 Generated with Claude Code

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

requirements.txt

@@ -16,7 +16,7 @@ langchain-core>=0.3.0
 anthropic>=0.39.0
 
 # Free baseline alternatives
-google-genai>=0.2.0         # Gemini 2.0 Flash (updated package)
+google-generativeai>=0.8.0  # Gemini 2.0 Flash (current SDK used in code)
 huggingface-hub>=0.26.0     # For HF Inference API (Qwen, Llama)
 
 # ============================================================================