feat(cli,display): add --health check and repo description column

Add --health option to verify Gitea connectivity and display version.
Add Description column (truncated at 40 chars) with --no-desc to hide
it. Add get_version() method to GiteaClient.

fixes #14
fixes #15

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_client.py

@@ -287,6 +287,30 @@ class TestGetWithRetry429:
         assert mock_sleep.call_count == 2
 
 
+class TestGetVersion:
+    """Test get_version method."""
+
+    def test_get_version_success(self):
+        """Returns version dict on success."""
+        client = GiteaClient("http://gitea.local:3000", "tok")
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.json.return_value = {"version": "1.21.0"}
+
+        with patch.object(client.session, "get", return_value=mock_resp):
+            result = client.get_version()
+
+        assert result == {"version": "1.21.0"}
+
+    def test_get_version_connection_error(self):
+        """ConnectionError propagates to caller."""
+        client = GiteaClient("http://gitea.local:3000", "tok")
+
+        with patch.object(client.session, "get", side_effect=requests.ConnectionError("refused")):
+            with pytest.raises(requests.ConnectionError):
+                client.get_version()
+
+
 class TestGetPaginatedEdgeCases:
     """Test edge cases for API responses."""