4cbe0a4ac4
New surface at /deep-research.php where the user pastes a question or uploads PDF/DOCX/TXT case files and a LLM-orchestrated agent researches the Do Better Norge legal corpus from 3-5 angles, with hybrid retrieval, cross-encoder rerank, and synthesis that emits an inline-[n]-cited markdown brief plus a numbered sources panel. Uploaded documents are chunked + embedded in memory only (nomic-embed-text via LiteLLM) and searched alongside the shared corpus during the same request — never persisted to disk, DB, or Qdrant. Reuses ClientRagPipeline::searchAll (hybrid + rerank), dbnV6 slice helpers, and the existing extract.php text-extraction logic via a new dbnToolsExtractUploadedFile() helper. Also adds dbnToolsCallGpuLlm() helper in bootstrap.php — fixes a latent bug where LegalTools.php was already calling that name with no definition. Search.php is unchanged.