feat: Implement recipe copy and delete functionality

Backend changes (C#):
- Add CopyRecipe method to MachineBridge
  - Generates new GUID for copied recipe
  - Returns new recipe with current timestamp
- Add DeleteRecipe method to MachineBridge
  - Prevents deletion of currently selected recipe
  - Returns success/failure status
- Add COPY_RECIPE and DELETE_RECIPE handlers in WebSocketServer

Frontend changes (React/TypeScript):
- Add CopyRecipe and DeleteRecipe to Window interface types
- Add copyRecipe and deleteRecipe methods to communication layer
- Implement handleCopy in RecipePage
  - Prompts user for new name
  - Adds copied recipe to list
  - Selects newly copied recipe
- Implement handleDelete in RecipePage
  - Shows confirmation dialog
  - Removes recipe from list
  - Selects next available recipe
- Connect Copy and Delete buttons with handlers
- Disable buttons when no recipe is selected

🤖 Generated with Claude Code

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

frontend/types.ts

@@ -60,6 +60,8 @@ declare global {
             SetIO(id: number, isInput: boolean, state: boolean): Promise<void>;
             SystemControl(command: string): Promise<void>;
             SelectRecipe(recipeId: string): Promise<string>;
+            CopyRecipe(recipeId: string, newName: string): Promise<string>;
+            DeleteRecipe(recipeId: string): Promise<string>;
             GetConfig(): Promise<string>;
             GetIOList(): Promise<string>;
             GetRecipeList(): Promise<string>;