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Add app_settings migration, settings UI, and OpenAI-compatible httpx LLM client with mocked tests. Preserve API keys on blank form submissions, require a fresh key when base_url changes, and keep AI search settings untouched for step 3. Update docs/design LLM integration and step 3 AI search notes, including prompt contract and extra-hints planning.
docs/design · 设计文档 / Design Docs
本目录存放面向具体改动轮次的设计与实施计划。 Design and implementation plans for specific rounds of changes.
当前轮次 / Current round — LLM 接入与迁移地基 / LLM Integration & Migration Foundation
本轮三件事 / Three deliverables：① 引入 Alembic 迁移系统（含封装）② LLM 接入（配置页 + 落库 + 客户端）③ 基础 AI 搜索（查询词扩展）。 本轮不含图片分析（留作未来，架构已预留接口）。Image analysis is not in this round (reserved for the future).
总体设计（High-level，"做什么/为什么"）/ High-level design ("what/why")：
| 文件 / File | 内容 / Contents |
|---|---|
llm-integration-design.md |
原则、架构、迁移子系统、LLM 接入、AI 搜索、安全、测试、未来扩展、决策记录（D1–D10）。 Principles, architecture, migration subsystem, LLM, AI search, security, testing, future seams, decisions log. |
实施计划（"怎么做"，每步一个自包含文件）/ Implementation plan ("how", one self-contained file per step)：
| 文件 / File | 内容 / Contents |
|---|---|
implementation-plan.md |
总览：步骤顺序、依赖、跨步骤约定。 Overview: sequence, dependencies, cross-cutting conventions. |
step-1-alembic-foundation.md |
步骤 1：Alembic 迁移地基（不改 schema）。 Step 1: migration foundation. |
step-2-llm-integration.md |
步骤 2：LLM 接入（app_settings + 客户端 + 配置页）。Step 2: LLM integration. |
step-3-ai-search.md |
步骤 3：基础 AI 搜索（查询词扩展）。 Step 3: basic AI search. |
每个 step 文件自包含：实现 Agent 每次只读对应的一个文件即可执行。 Each step file is self-contained — an implementation agent only needs to read that one file.
实现与设计若有偏差，请回写本目录，并同步仓库简报
../repository-brief.md（尤其 §10 迁移、§15 约束）。 If implementation diverges, update these docs and the brief (../repository-brief.md, esp. §10 & §15).