Restructure app

.air.toml

@@ -5,7 +5,7 @@ tmp_dir = "tmp"
 [build]
 args_bin = []
 bin = "./tmp/main"
-cmd = "go build -o ./tmp/main ./app/main.go"
+cmd = "go build -o ./tmp/main ./app/."
 delay = 1000
 exclude_dir = ["assets", "tmp", "vendor", "testdata", "build"]
 exclude_file = []