Start AI knowledge base v2 workspace

ai_knowledge_base_v2/README.md

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+# AI Knowledge Base V2 Workspace
+
+This folder is the new workspace for the changed requirement: **AI 企业知识库问答系统**.
+
+It is intentionally separated from the existing `hy_qa_asset_backend/docs` folder because the old implementation was an MVP for "大本营答疑资产后台系统", while the new requirement is a broader AI knowledge base product with login, permission control, chat sessions, admin management, Feishu real-time retrieval, and RAG.
+
+## Directory Layout
+
+- `source_documents/`: original PRD, SRS, API, database, RAG, prototype, plan, test, UAT, deployment, data dictionary, and permission matrix files.
+- `extracted/`: machine-extracted Markdown versions of the source documents for search and review.
+- `development_records/`: new project development notes, decisions, scope records, and future implementation logs.
+- `reports/`: assessment and design reports for this new version.
+
+## Current Goal
+
+Build a new version based on the uploaded AI knowledge base requirement package:
+
+- User side: phone/SMS login, AI chat, sessions, history, streaming response, stop generation, Markdown rendering, and knowledge permission filtering.
+- Admin side: admin login, user management, admin management, knowledge base management, Prompt management, model management, chat records, dashboard, system config, and operation logs.
+- AI/RAG: Feishu knowledge base as the only knowledge source in phase one, real-time retrieval per question, permission-based knowledge filtering, Prompt assembly, model invocation, SSE streaming, and AI request logging.
+- Phase-one exclusions: file upload, OCR, image understanding, web search, local vector database sync, payment, course system, automatic authorization, multi-tenant, multi-Prompt, regenerate answer, and edit message.
+
+## Working Principles
+
+- Keep this version additive and isolated until the architecture decision is confirmed.
+- Do not put new planning records into the old `hy_qa_asset_backend/docs` directory.
+- Treat the uploaded documents as the source of truth for V2.
+- Record major implementation decisions in `development_records/` before or alongside code changes.
+- Reuse old code only where the domain boundary still matches; do not force old "QA asset review" models into the new "AI knowledge base chat" model.