feat(kb): Add PDF and DOCX ingestion support for Knowledge Bases

[Cristhianzl]

Objective
Enable Knowledge Base ingestion and preview of PDF and DOCX files using existing project dependencies.

Changes

• Add pdf and docx to accepted file types in KB upload modal
• Create centralized extract_text_from_bytes() in data utils for binary file parsing
• Replace raw UTF-8 decode with extract_text_from_bytes() in ingestion and preview endpoints
• Add error handling with ValueError for corrupted PDF/DOCX files
• Add 22 unit tests covering happy path, adversarial, and edge cases

[coderabbitai]

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