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[#92] Integrate smart search & clean unused code

Daniel JIANUrequested to merge
#92-integrate-smart-search into development

This PR integrates the smart search API and drastically simplifies the search logic. It also removes unused code.

Please note that semantic search based on documents has been temporarily disabled until #91 (closed) is implemented.

Captură_de_ecran_din_2025-07-03_la_09.18.46

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