Start AI knowledge base v2 workspace

ai_knowledge_base_v2/development_records/2026-07-06-initial-context.md

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+# 2026-07-06 Initial Context
+
+## Background
+
+The project requirement changed significantly on 2026-07-06. The previous implementation focused on a backend/admin MVP for extracting, cleaning, reviewing, and marking "大本营答疑资产" as callable QA assets. The new requirement package defines an **AI 企业知识库问答系统**.
+
+## Source Package Archived
+
+The uploaded source documents were copied into:
+
+`ai_knowledge_base_v2/source_documents/`
+
+Machine-extracted Markdown files were generated into:
+
+`ai_knowledge_base_v2/extracted/`
+
+The source package includes PRD, SRS, database design, API design, RAG design, admin prototype notes, implementation plan, test cases, UAT criteria, deployment manual, field dictionary, and permission matrix.
+
+## Current Understanding
+
+The new system should use Feishu knowledge bases as the only phase-one knowledge source. Each user question should:
+
+1. Validate user account and daily quota.
+2. Resolve the user's authorized knowledge bases.
+3. Retrieve content from Feishu in real time.
+4. Assemble Prompt from system Prompt, retrieved snippets, user question, and controlled context.
+5. Call the configured model.
+6. Stream the answer through SSE.
+7. Persist question, answer, retrieval snippets, Prompt/model info, token usage, cost, and status.
+
+## Key Decisions
+
+- Create a new `ai_knowledge_base_v2/` workspace instead of mixing V2 records into old docs.
+- Preserve all uploaded documents as source artifacts.
+- Generate extracted Markdown for searchable project context.
+- Treat old code as a reference implementation, not as the direct domain model for V2.
+- Prefer reusable technical infrastructure from old code only after matching it against V2 requirements.
+
+## Open Questions
+
+- SMS provider is not specified yet. We need a mock provider for local development and a real provider decision before production.
+- Final model provider and API compatibility need confirmation.
+- Feishu real-time retrieval API details need implementation validation against the actual tenant permissions and knowledge base structure.
+- Whether V2 should be created as a sibling app inside this repository or split into a separate repository can be decided after architecture planning.

ai_knowledge_base_v2/development_records/README.md

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+# Development Records
+
+This folder stores the AI knowledge base V2 development process records.
+
+Use it for:
+
+- scope decisions
+- architecture decisions
+- implementation plans
+- daily or milestone notes
+- unresolved questions
+- test and acceptance observations
+
+Do not store these records in the old `hy_qa_asset_backend/docs` folder. That folder belongs to the earlier "答疑资产后台系统" phase.