feat(ai-core): mood state machine and affection level

- new emotion package: rule-based sentiment (positive/negative lexicon)
  drives mood transitions (开心/平静/难过) with 30min inactivity decay;
  affection 0-100 grows with positive interaction, with 初识→熟悉→信赖→
  羁绊 tiers
- pipeline records each user message and injects a mood line into the
  system prompt so the persona's tone follows her mood
- mood changes broadcast over WS; frontend shows a mood badge with
  affection tooltip; also handles the 'reminder' message type from the
  reminder scheduler
- tests: sentiment scoring, mood shift, affection bounds, prompt line,
  onChange callback

frontend/web/src/components/chat/ChatContainer.tsx

@@ -4,9 +4,14 @@ import { useWebSocket } from '../../hooks/useWebSocket'
 import MessageList from './MessageList'
 import ChatInput from './ChatInput'
 
+function moodEmoji(mood: string): string {
+  const map: Record<string, string> = { 开心: '😊', 平静: '😌', 难过: '😢', 害羞: '☺️', 感动: '🥹' }
+  return map[mood] || '😌'
+}
+
 export default function ChatContainer() {
   const { send } = useWebSocket()
-  const { messages, isStreaming, currentSessionId, inputText, setInput, addMessage, setStreaming } = useChatStore()
+  const { messages, isStreaming, currentSessionId, inputText, mood, setInput, addMessage, setStreaming } = useChatStore()
   const bottomRef = useRef<HTMLDivElement>(null)
 
   useEffect(() => {
@@ -34,7 +39,16 @@ export default function ChatContainer() {
   }
 
   return (
-    <div className="flex flex-col h-full">
+    <div className="flex flex-col h-full relative">
+      {/* Mood badge */}
+      {mood && (
+        <div className="absolute top-3 right-4 z-10 px-3 py-1 rounded-full text-xs border"
+          style={{ background: 'var(--mx-surface)', borderColor: 'var(--mx-outline)', color: 'var(--mx-text-dim)' }}
+          title={`好感度 ${mood.affection}/100`}>
+          {moodEmoji(mood.mood)} {mood.mood}
+        </div>
+      )}
+
       {/* Chat area */}
       <div className="flex-1 overflow-auto">
         <div className="max-w-2xl mx-auto px-4 py-6">

frontend/web/src/hooks/useWebSocket.ts

@@ -7,7 +7,7 @@ import type { WSMessage } from '../types/chat'
 export function useWebSocket() {
   const wsRef = useRef<WebSocket | null>(null)
   const reconnectRef = useRef(0)
-  const { addMessage, appendToLast, setStreaming, setIotDevices, currentSessionId } = useChatStore()
+  const { addMessage, appendToLast, setStreaming, setIotDevices, setMood, currentSessionId } = useChatStore()
 
   const connect = useCallback(() => {
     const token = getToken()
@@ -52,6 +52,17 @@ export function useWebSocket() {
               })
             }
             break
+          case 'mood':
+            if (msg.mood) setMood({ mood: msg.mood, intensity: msg.intensity || 0, affection: msg.affection || 0 })
+            break
+          case 'reminder':
+            if (msg.content) {
+              addMessage({
+                id: crypto.randomUUID(), session_id: currentSessionId || '',
+                role: 'system', content: `⏰ ${msg.content}`, created_at: new Date().toISOString(),
+              })
+            }
+            break
           case 'error':
             addMessage({ id: crypto.randomUUID(), session_id: '', role: 'system',
               content: `Error: ${msg.error}`, created_at: new Date().toISOString() })

frontend/web/src/store/chatStore.ts

@@ -1,16 +1,24 @@
 import { create } from 'zustand'
 import type { Message, IotDevice } from '../types/chat'
 
+interface MoodState {
+  mood: string
+  intensity: number
+  affection: number
+}
+
 interface ChatState {
   messages: Message[]
   isStreaming: boolean
   currentSessionId: string | null
   iotDevices: IotDevice[]
   inputText: string
+  mood: MoodState | null
 
   setInput: (text: string) => void
   setSessionId: (id: string) => void
   setMessages: (msgs: Message[]) => void
+  setMood: (m: MoodState) => void
   addMessage: (msg: Message) => void
   appendToLast: (content: string) => void
   setStreaming: (v: boolean) => void
@@ -24,10 +32,12 @@ export const useChatStore = create<ChatState>((set, get) => ({
   currentSessionId: null,
   iotDevices: [],
   inputText: '',
+  mood: null,
 
   setInput: (text) => set({ inputText: text }),
   setSessionId: (id) => set({ currentSessionId: id }),
   setMessages: (msgs) => set({ messages: msgs }),
+  setMood: (m) => set({ mood: m }),
   setStreaming: (v) => set({ isStreaming: v }),
   setIotDevices: (d) => set({ iotDevices: d }),
 

frontend/web/src/types/chat.ts

@@ -32,4 +32,7 @@ export interface WSMessage {
   devices?: IotDevice[]
   title?: string
   body?: string
+  mood?: string
+  intensity?: number
+  affection?: number
 }