Add in-editor Slate setup wizard (Tools > MCP Setup Wizard)

Native UE editor tab (SMCPWizard) so setup happens inside Unreal, not just the
Node CLI. Three sections:
- Remote Control: live status of the :30010 bridge + a button to start it
  (WebControl.StartServer + EnableServerOnStartup).
- API keys: paste/save the agent-gateway Anthropic token (auth.env) and
  ElevenLabs key (integrations.json) — both git-ignored.
- MCP tools: lists the catalogue from tools.json.

Wiring:
- UEBlueprintMCPEditor module registers a nomad tab + a Tools-menu entry.
- Build.cs gains the Projects module (IPluginManager).
- server.js exports TOOLS and only launches the stdio server when run directly
  (isMain), so src/dumpTools.mjs can generate tools.json. `npm run dump-tools`.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Source/UEBlueprintMCPEditor/Public/UEBlueprintMCPEditor.h

@@ -18,6 +18,8 @@ private:
     friend class FMCPZoneInputProcessor;
 
     void RegisterMenus();
+    void RegisterWizardTabAndMenu();
+    TSharedRef<class SDockTab> SpawnWizardTab(const class FSpawnTabArgs& Args);
     void NotifyBridgeStatus();
     void ToggleMCPZoneMode(TWeakPtr<FBlueprintEditor> BlueprintEditor);
     bool IsMCPZoneModeActive(TWeakPtr<FBlueprintEditor> BlueprintEditor) const;
@@ -26,6 +28,7 @@ private:
     void RemoveMCPZones(UBlueprint* Blueprint) const;
 
     bool bMCPZoneModeActive = false;
+    bool bWizardTabRegistered = false;
     TWeakPtr<FBlueprintEditor> ActiveMCPZoneEditor;
     TSharedPtr<IInputProcessor> MCPZoneInputProcessor;
 };