Show MCP server status via ribbon icon (ON/OFF)

[laytonluo]

Summary

• The MCP toggle button ("MCP 服務 (開/關)") currently has no icon at all — only text — and the running/stopped state is only ever surfaced through a one-off TaskDialog popup, so there's no persistent visual indicator on the ribbon.
• Adds an ON/OFF icon to the button's LargeImage, kept in sync with Application.SocketService.IsRunning.
• The tooltip now shows the state plus the configured listening port (ConfigManager.Instance.Settings.Port).

Note on CI

I see check-pr.yml restricts fork PRs to domain/*.md and GEMINI.md only, so this PR (touching MCP/Application.cs, MCP/Commands/MCPCommands.cs, MCP/RevitMCP.csproj, and two new icon resources) is expected to fail that check. Opening it anyway per the repo owner's own request, so it's here for visibility/discretion rather than an auto-mergeable contribution — happy to close it, rework it into an Issue, or adjust however you'd prefer.

Test plan

• Not build-verified locally — this machine only has the .NET 10 runtime, not the SDK that Nice3point.Revit.Sdk 6.1.0's build task requires (dotnet build -c Release.R24 fails with MSB4062 loading the SDK's own task assembly). The change itself is small (two BitmapImage swaps + a tooltip string), and mirrors the same pattern already applied and manually verified in a sibling project (revit-mcp-plugin).
• Please build for at least one Revit version and confirm the ribbon button shows the OFF icon on startup, switches to ON on click with the correct port in the tooltip, and switches back on the second click.

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