GRM-16: feat: add --force flag to grm remove for unreachable runners

- Add force parameter to RunnerManager.remove() — skips remote Ansible
  playbook and only removes the local registry entry
- Add --force/-f CLI flag to grm remove command
- Add translations for --force help text across all 5 languages
- Add unit tests for force skip and CLI flag propagation
- 118 tests, 100% coverage, pyright clean, ruff clean

src/gitea_runner_manager/cli.py

@@ -306,6 +306,12 @@ def status(
     type=click.Choice(["docker", "binary"]),
     help=_("Override deployment mode from registry"),
 )
+@click.option(
+    "--force",
+    "-f",
+    is_flag=True,
+    help=_("Skip remote cleanup and only remove the local registry entry"),
+)
 @_handle_errors("Remove failed: {error}")
 def remove(
     runner_name: str,
@@ -314,6 +320,7 @@ def remove(
     key: str | None,
     token: str | None,
     mode: str | None,
+    force: bool,
     ask_become_pass: bool,
 ) -> None:
     manager = RunnerManager()
@@ -326,6 +333,7 @@ def remove(
         gitea_url=os.getenv("GITEA_URL", ""),
         mode=mode,
         ask_become_pass=ask_become_pass,
+        force=force,
     )