新增: Phase2 阶段收尾（Sprint 1-20）

重构：删 5 零引用 crate（df-evolve/plugin/stages/task/traceability）+ 清死模块、ai.rs 拆 11 子 module、ai.ts 拆 6 composable、i18n 拆目录
功能：知识库全栈（df-project/scan + CRUD + 时间线 + 前端）、Settings 拆分、appSettings KV 迁移、模型池、LLM 并发 Semaphore
修复：审批持久化根治、ConditionEngine 默认拒绝、NodeRegistry unimplemented 清除、promote 补偿删除、工具结果截断 50KB、路径校验防 symlink 逃逸
文档：B-03 人工审批设计、决策记录三分档、规格契约自检、经验记录、todo 看板、PROGRESS 更新

详见 PROGRESS.md。src-tauri/儿童每日打卡应用/ 与本项目无关，已排除。

src/i18n/en/aiChat.ts

@@ -0,0 +1,64 @@
+export default {
+  aiChat: {
+    // ── Conversation sidebar ──
+    sidebarTitle: 'Chats',
+    newConversation: 'New chat',
+    doubleClickToRename: 'Double-click to rename',
+    archive: 'Archive',
+    unarchive: 'Unarchive',
+    archived: 'Archived',
+    archivedCount: 'Archived ({n})',
+    emptyConversation: 'No conversations',
+
+    // ── Time grouping (sidebar) ──
+    today: 'Today',
+    yesterday: 'Yesterday',
+    earlier: 'Earlier',
+
+    // ── Header buttons ──
+    conversationList: 'Chat list',
+    maximize: 'Maximize',
+    restoreSidebar: 'Restore sidebar',
+    detachWindow: 'Detach window',
+    closePanel: 'Close panel',
+    dockRight: 'Dock to main window right',
+    undock: 'Undock',
+    pinOnTop: 'Pin on top',
+    unpin: 'Unpin',
+    closeWindow: 'Close window',
+
+    // ── Provider status ──
+    clickToSwitchProvider: 'Click to switch provider',
+    providerNotConfigured: 'No AI provider configured. Please add one in settings.',
+    notConfigured: 'Not configured',
+
+    // ── Empty states ──
+    emptyNoProvider: 'No AI provider configured',
+    emptyNoProviderHint: 'Please add a provider in settings to start chatting',
+    emptyTitle: 'Chat with AI assistant',
+    emptyHint: 'Try "create a project" or "list all tasks"',
+
+    // ── Back to bottom ──
+    backToBottom: 'Back to bottom',
+
+    // ── Pending queue ──
+    queueTitle: 'Queued {n}/10',
+    clearQueue: 'Clear',
+
+    // ── Skill ──
+    clearSkill: 'Clear skill',
+    placeholderWithSkill: 'Skill selected. Type arguments and press Enter',
+    placeholderDefault: 'Type a message... (/ for skills)',
+    skillNoMatch: 'No matching skill',
+    skillNotLoaded: 'No local skills loaded',
+
+    // ── Send ──
+    stopGenerating: 'Stop generating',
+
+    // ── Input hint ──
+    inputHint: 'Enter to send · Shift+Enter for newline',
+
+    // ── Confirm dialog ──
+    confirmDeleteConversation: 'Delete chat "{title}"? This cannot be undone.',
+  },
+}