feat: consolidate backend and docker-compose setup

backend/.dockerignore

@@ -0,0 +1,14 @@
+.git
+.github
+.venv
+.venv-api
+PaddleOCR-VL-1.6_Online_Demo/.venv
+**/__pycache__
+**/*.pyc
+.cache
+.python-version
+issues
+*.md
+pfm-web-app/node_modules
+pfm-web-app/.next
+