refactor: move cmd handlers to cmd/cli/commands/ following tag_file architecture

cmd/cli/main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	_ "git.yoresee.cc/nightstar/ry/internal/provider/rainyun"
+)
+
+func main() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}