fix: simplify DDEV command usage in setup instructions

.roo/rules/rules.md

@@ -128,20 +128,20 @@ This workflow ensures thorough understanding, proper planning, clean implementat
 1. **Initial Setup**
    ```bash
    ddev start
-   ddev exec composer install
-   ddev exec npm install
+   ddev composer install
+   ddev npm install
    ```
 2. **Development Build**
    ```bash
-   ddev exec npm run dev
+   ddev npm run dev
    ```
 3. **Production Build**
    ```bash
-   ddev exec npm run build
+   ddev npm run build
    ```
 4. **Clear TYPO3 Cache**
    ```bash
-   ddev exec vendor/bin/typo3cms cache:flush
+   ddev typo3cms cache:flush
    ```
 5. **Add a ContentBlock**
    - Create folder, config, templates, translations