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_display.py

@@ -230,6 +230,66 @@ class TestRenderDashboardEmpty:
         assert "Aucun repo" in output
 
 
+class TestDescriptionColumn:
+    """Test Description column in dashboard table."""
+
+    def test_description_column_displayed(self):
+        """Table contains a Description column by default."""
+        console, buf = _make_console()
+        repos = [_make_repo(name="test", description="My project")]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "Description" in output
+        assert "My project" in output
+
+    def test_description_truncated_at_40(self):
+        """Description longer than 40 chars is truncated with '...'."""
+        console, buf = _make_console()
+        long_desc = "A" * 60
+        repos = [_make_repo(name="test", description=long_desc)]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        # Should contain first 40 chars + "..."
+        assert "A" * 40 + "..." in output
+        # Should NOT contain the full 60-char string
+        assert "A" * 60 not in output
+
+    def test_description_short_not_truncated(self):
+        """Description of 20 chars is displayed as-is."""
+        console, buf = _make_console()
+        repos = [_make_repo(name="test", description="Short description")]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "Short description" in output
+
+    def test_description_empty(self):
+        """Empty description renders without crash."""
+        console, buf = _make_console()
+        repos = [_make_repo(name="test", description="")]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "test" in output
+
+    def test_no_description_flag(self):
+        """show_description=False hides the Description column."""
+        console, buf = _make_console()
+        repos = [_make_repo(name="test", description="My project")]
+
+        render_dashboard(repos, console=console, show_description=False)
+        output = buf.getvalue()
+
+        assert "Description" not in output
+        assert "test" in output
+
+
 class TestRenderDashboardEdgeCases:
     """Test edge cases for dashboard rendering."""