feat: Add make help target

Makefile

@@ -1,4 +1,4 @@
-.PHONY: build run dev stop logs test migrate clean install start restart status
+.PHONY: help build run dev stop logs test migrate clean install start restart status
 
 APP_NAME := esp32-web
 PORT := 5500
@@ -6,6 +6,32 @@ HOST := 0.0.0.0
 PIDFILE := /tmp/esp32-web.pid
 LOGFILE := /tmp/esp32-web.log
 
+help:
+	@echo "ESP32-Web Server"
+	@echo ""
+	@echo "Server:"
+	@echo "  make start     Start server ($(HOST):$(PORT))"
+	@echo "  make stop      Stop server"
+	@echo "  make restart   Restart server"
+	@echo "  make status    Show PID + uptime"
+	@echo "  make logs      Tail log file"
+	@echo "  make dev       Run with debug mode"
+	@echo ""
+	@echo "Database:"
+	@echo "  make migrate   Apply migrations"
+	@echo "  make migrate-init          Initialize migrations"
+	@echo "  make migrate-create msg=x  Create migration"
+	@echo ""
+	@echo "Development:"
+	@echo "  make install   Install with dev dependencies"
+	@echo "  make test      Run tests"
+	@echo "  make clean     Remove cache files"
+	@echo ""
+	@echo "Container:"
+	@echo "  make build          Build image"
+	@echo "  make container-run  Run container"
+	@echo "  make container-stop Stop container"
+
 install:
 	pip install -e ".[dev]"