feat: Remove google-generativeai from requirements.txt to streamline dependencies

Author: smirk-dev

backend/requirements.txt

@@ -9,7 +9,6 @@ uvicorn>=0.24.0
 python-multipart>=0.0.6
 
 # Google AI & Cloud Services
-google-generativeai>=0.8.0
 google-cloud-firestore>=2.16.0
 google-cloud-storage>=2.14.0
 google-auth>=2.25.0