✨ Move CLI commands to cli/ package for extensibility

- Rename internal/cmd/ to cli/
- Export commands: RootCmd, DropCmd, ConfigCmd
- Enable custom app creation by importing cli package

cmd/my-log/main.go

@@ -16,8 +16,8 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 package main
 
-import "codeberg.org/danjones000/my-log/internal/cmd"
+import "codeberg.org/danjones000/my-log/cli"
 
 func main() {
-	cmd.Execute()
+	cli.Execute()
 }