Add spaghetti recipe and preparation documentation

[dev-docs-github-app-dev]

This PR introduces a new documentation file that provides comprehensive information about spaghetti. The documentation includes:

• Basic description and specifications of spaghetti pasta
• Step-by-step cooking instructions
• Various serving suggestions and sauce pairings
• Nutritional information
• Storage guidelines and food safety tips

The new document (docs/recipes/spaghetti.md) serves as a complete reference guide for understanding, preparing, and storing spaghetti. This addition enhances our recipe documentation collection with clear, well-structured information about this popular pasta dish.

[dev-docs-github-app-dev]

This pull request was created by AI Agent. Please review the changes and provide feedback. Context used:

                    ```json
                    {

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{
"filePath": "docs/recipes/spaghetti.md",
"branch": "main"
}
],
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"relevantDocsFiles": [
{
"filePath": "README.md",
"branch": "main"
}
]
}
```