chore: improve --workdir option description

Updated the help text for the --workdir command line option in both
ll-builder and ll-cli applications. Changed from "Working directory
inside the app" to "Specify the working directory where the application
runs" to provide clearer and more accurate description of the option's
functionality.

The previous description was somewhat ambiguous and didn't clearly
indicate that this option specifies the directory where the application
will execute. The new description better communicates the purpose of the
--workdir option to users.

Influence:
1. Verify --workdir option help text displays correctly in both
applications
2. Test that the option functionality remains unchanged
3. Confirm help text consistency across different command help sections
4. Check that option validation and parsing behavior is unaffected

Author: dengbo11

apps/ll-builder/src/main.cpp

@@ -788,7 +788,7 @@ You can report bugs to the linyaps team under this project: https://github.com/O
       ->delimiter(',')
       ->allow_extra_args(false)
       ->type_name("modules");
-    buildRun->add_option("--workdir", runOpts.workdir, _("Working directory inside the app"))
+    buildRun->add_option("--workdir", runOpts.workdir, _("Specify the working directory where the application runs"))
       ->type_name("PATH");
     buildRun->add_option(
       "COMMAND",

apps/ll-cli/src/main.cpp

@@ -179,7 +179,10 @@ ll-cli run org.deepin.demo -- bash -x /path/to/bash/script)"));
                    _("Specify the runtime used by the application to run"))
       ->type_name("REF")
       ->check(validatorString);
-    cliRun->add_option("--workdir", runOptions.workdir, _("Working directory inside the app"))
+    cliRun
+      ->add_option("--workdir",
+                   runOptions.workdir,
+                   _("Specify the working directory where the application runs"))
       ->type_name("PATH");
     cliRun
       ->add_option("--extensions",