🧹 [Refactored process_new_post to use dataclass]

[marko1olo]

🎯 What: Refactored process_new_post parameters into a NewPostParams dataclass.
💡 Why: To fix the 'Too Many Parameters' code health issue and improve maintainability.
✅ Verification: Ran test_main.py and verified it passes.
✨ Result: Improved readability and cleaner function signatures.

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PR created automatically by Jules for task 9422678655191853773 started by @marko1olo

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