feat: consolidate backend and docker-compose setup

backend/.gitignore

@@ -0,0 +1,17 @@
+.venv/
+.venv-api/
+.env
+__pycache__/
+*.pyc
+.python-version
+.antigravitycli/
+PaddleOCR-VL-1.6_Online_Demo/examples/do-pfm/*.jpg
+pfm-web-app/public/do-pfm/*
+uploads/*
+pfm-web-app/public/produk-pfm/**/*.jpeg
+pfm-web-app/public/produk-pfm/yolo_dataset/*
+pfm-web-app/public/produk-pfm/runs/*
+pfm-web-app/public/produk-pfm/models/*
+*.pt
+test_img.jpeg
+screenshots/*.jpg