Add SaaS AI engine (#5907)

engine/.gitignore

@@ -0,0 +1,46 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+env/
+venv/
+ENV/
+build/
+dist/
+*.egg-info/
+
+# Node
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.vite/
+
+# Environment
+.env
+.env.local
+
+# LaTeX outputs
+*.aux
+*.log
+*.out
+*.toc
+*.pdf
+*.tex
+!src/default_templates/*.tex
+data/
+output/
+logs/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db