Add AI DEV Node deployment foundation

.gitignore

@@ -6,6 +6,8 @@ backend/target/
 frontend/node_modules/
 frontend/dist/
 frontend/.vite/
+node_modules/
+dist/
 *.tsbuildinfo
 
 # IDE / OS
@@ -19,6 +21,8 @@ Thumbs.db
 
 # Local env
 infra/.env
+.env
+.project-env
 
 # Editor/EDR leftover temp files (see docs/issues-and-guidelines.md §2-3)
 *.tmp.*