feat: add docker run target and configure app for containerization

Co-authored-by: Antigravity <antigravity@deepmind.com>

Makefile

@@ -1,4 +1,4 @@
-.PHONY: help fees match web image
+.PHONY: help fees match web image run
 
 export PYTHONPATH := scripts:$(PYTHONPATH)
 VENV := .venv
@@ -14,6 +14,7 @@ help:
 	@echo "  make match  - Match Fio bank payments against expected attendance fees"
 	@echo "  make web    - Start a dynamic web dashboard locally"
 	@echo "  make image  - Build an OCI container image"
+	@echo "  make run    - Run the built Docker image locally"
 
 fees: $(PYTHON)
 	$(PYTHON) scripts/calculate_fees.py
@@ -26,3 +27,6 @@ web: $(PYTHON)
 
 image:
 	docker build -t fuj-management:latest -f build/Dockerfile .
+
+run:
+	docker run -it --rm -p 5001:5001 fuj-management:latest