fix: Fix entrypoint

cmd/gis/main.go

@@ -0,0 +1,11 @@
+// Command gis is the entrypoint for the GIS application.
+//
+// It exposes subcommands for running the HTTP server, the RabbitMQ worker, and
+// database migrations. See `gis --help` for details.
+package main
+
+import "gis/internal/cli"
+
+func main() {
+	cli.Execute()
+}