new feature: validate input data coming in #466
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Added input validation to FirstSearchNode and ReflectionNode in MediaEngine/nodes/search_node.py. Introduced an InputValidator class that checks types, enforces length limits (title: 500 chars, content: 10k chars), sanitizes strings, validates JSON structure, and provides clear error messages. Both nodes now validate and sanitize inputs before processing, improving error handling and preventing invalid data from reaching downstream logic. The validator also warns about unknown fields while maintaining backward compatibility.