[FEAT] Knowledge Base RAG multi-livello (SYSTEM/FIRM/ORG) + Qdrant + Voyage
- KnowledgeBaseController: ingest, list, firmOrgs, search, delete
- VectorService (Qdrant + buildAuthzFilter), EmbedService (Voyage), RagService (pipeline)
- AIService::askWithRag con fallback graceful
- docker-compose: servizio qdrant + env Voyage (chiave da .env/vault, no hardcoded)
- SQL 012 consulting_firms, 013 firm_assignments + kb_uploaded_documents
- public/kb.html + kb.js (upload, lista, search preview)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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