Complete backend production integrations

ansible/roles/cezen-backend/files/requirements.txt

@@ -9,5 +9,12 @@ aiofiles>=23.0.0
 # Document Intelligence
 pymupdf>=1.24.0          # PDF text extraction (fitz)
 python-docx>=1.1.0       # Word document extraction
+pypdf>=4.2.0             # RAG ingest PDF text extraction
+pdfminer.six>=20231228   # RAG ingest PDF fallback parser
 # Scheduled Jobs
 apscheduler>=3.10.0      # In-process cron/interval scheduler
+# Meeting audio transcription
+faster-whisper>=1.0.0
+# Connector drivers
+psycopg2-binary>=2.9.9
+pymysql>=1.1.0