Update ISO installer tiers and backend deployment

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

@@ -0,0 +1,13 @@
+fastapi>=0.111.0
+uvicorn[standard]>=0.29.0
+python-jose[cryptography]>=3.3.0
+passlib[bcrypt]>=1.7.4
+bcrypt<4.0.0
+psutil>=5.9.0
+python-multipart>=0.0.9
+aiofiles>=23.0.0
+# Document Intelligence
+pymupdf>=1.24.0          # PDF text extraction (fitz)
+python-docx>=1.1.0       # Word document extraction
+# Scheduled Jobs
+apscheduler>=3.10.0      # In-process cron/interval scheduler