feat(ai-chat): 聊天 UI 配置 V3 — 名称/头像/时间配置项消费

- CHAT_UI_DEFAULTS 同步后端 4 新键 (show_name/show_avatar/avatar/time_format/time_humanize)
- 标题与 AI 头像按开关显隐, 自定义头像 (素材库 pic_path / URL) 优先于内置
- formatTime 支持 auto(智能分段)/full(完整) 与 humanizeTime 相对时间优先 (刚刚/N分钟前/N小时前/昨天/前天/M月D日/Y年M月D日)
- i18n 中英各+5 键

common/js/ai-service.js

@@ -451,7 +451,16 @@ const CHAT_UI_DEFAULTS = {
   ui_enable_attachment_types: ['image', 'file', 'audio', 'video'],
   ui_input_max_length: 500,
   ui_available_models: ['Auto'],
-  ui_enable_feedback: true
+  ui_enable_feedback: true,
+  // PR-CHAT-UI-CONFIG-V2 (2026-09-24): 与后端 Config::DEFAULT_UI_CONFIG 同步
+  ui_assistant_name: '',
+  // PR-CHAT-UI-CONFIG-V3 (2026-09-24): 与后端 Config::DEFAULT_UI_CONFIG 同步
+  ui_show_assistant_name: true,
+  ui_show_assistant_avatar: true,
+  ui_assistant_avatar: '',
+  ui_show_message_time: true,
+  ui_time_format: 'auto',
+  ui_time_humanize: false
 };
 
 // chat_ui_config 自带短 TTL 缓存(60s, 与 service_config 同步);

lang/en-us/ai-chat/index.js

@@ -12,6 +12,12 @@ export const lang = {
 	timeFormatToday: 'Today',
 	timeFormatYesterday: 'Yesterday',
 	timeFormatBeforeYesterday: 'Day before yesterday',
+	// PR-CHAT-UI-CONFIG-V3 (2026-09-24): Humanized relative time (ui_time_humanize)
+	timeJustNow: 'Just now',
+	timeMinutesAgo: '{n} min ago',
+	timeHoursAgo: '{n} h ago',
+	timeMonthDay: '{m}/{d}',
+	timeYearMonthDay: '{y}/{m}/{d}',
 
 	// ====== ai-chat-message ======
 	aiNickname: 'AI Assistant',

lang/zh-cn/ai-chat/index.js

@@ -12,6 +12,12 @@ export const lang = {
 	timeFormatToday: '今天',
 	timeFormatYesterday: '昨天',
 	timeFormatBeforeYesterday: '前天',
+	// PR-CHAT-UI-CONFIG-V3 (2026-09-24): 人性化相对时间 (ui_time_humanize)
+	timeJustNow: '刚刚',
+	timeMinutesAgo: '{n}分钟前',
+	timeHoursAgo: '{n}小时前',
+	timeMonthDay: '{m}月{d}日',
+	timeYearMonthDay: '{y}年{m}月{d}日',
 
 	// ====== ai-chat-message ======
 	aiNickname: '智能助手',

pages_tool/ai-chat/ai-chat-message.vue

@@ -13,7 +13,9 @@
     
     <!-- 顶部栏: 标题 + 新对话 -->
     <view class="chat-topbar">
-      <text class="chat-title">{{ $lang('ai-chat.index.aiNickname') }}</text>
+      <!-- PR-CHAT-UI-CONFIG-V2 (2026-09-24): 智能体显示名走后端配置, 空则回落 i18n 默认
+           PR-CHAT-UI-CONFIG-V3 (2026-09-24): ui_show_assistant_name 控制顶栏名称显隐 -->
+      <text class="chat-title" v-if="chatUiConfig.ui_show_assistant_name">{{ chatUiConfig.ui_assistant_name || $lang('ai-chat.index.aiNickname') }}</text>
       <view class="new-chat-btn" @click="onNewChat">
         <!-- 气泡+加号线性图标 (base64 SVG: 小程序不支持内联 SVG) -->
         <view class="new-chat-icon"></view>
@@ -137,7 +139,8 @@
 
         <!-- AI消息 -->
         <view v-else class="ai-message">
-          <view class="avatar">
+          <!-- PR-CHAT-UI-CONFIG-V3 (2026-09-24): ui_show_assistant_avatar 控制头像显隐; 自定义头像在 aiAvatarUrl computed 优先 -->
+          <view class="avatar" v-if="chatUiConfig.ui_show_assistant_avatar">
             <!-- 智能客服头像 -->
             <image
               v-if="aiAvatarUrl && !avatarError"
@@ -163,7 +166,7 @@
             </view>
 
             <!-- AI 回答上方只显示时间（昵称"智能助手"已按需求移除） -->
-            <view class="message-nickname ai-nickname">
+            <view class="message-nickname ai-nickname" v-if="chatUiConfig.ui_show_message_time">
               <text class="message-time">{{ formatTime(message.timestamp) }}</text>
             </view>
             <view class="message-bubble">
@@ -737,7 +740,16 @@ export default {
       ui_enable_attachment_types: ['image', 'file', 'audio', 'video'],
       ui_input_max_length: 500,
       ui_available_models: ['Auto'],
-      ui_enable_feedback: true
+      ui_enable_feedback: true,
+      // PR-CHAT-UI-CONFIG-V2 (2026-09-24): 与后端 Config::DEFAULT_UI_CONFIG 同步
+      ui_assistant_name: '',
+      // PR-CHAT-UI-CONFIG-V3 (2026-09-24): 与后端 Config::DEFAULT_UI_CONFIG 同步
+      ui_show_assistant_name: true,
+      ui_show_assistant_avatar: true,
+      ui_assistant_avatar: '',
+      ui_show_message_time: true,
+      ui_time_format: 'auto',
+      ui_time_humanize: false
     },
     chatUiConfigLoaded: false,
 
@@ -768,13 +780,18 @@ export default {
     }
   },
   computed: {
+    // PR-CHAT-UI-CONFIG-V3 (2026-09-24): 后台配置了自定义头像则优先 ($util.img 兼容 pic_path 与完整 URL)
     aiAvatar() {
+      const custom = this.chatUiConfig && this.chatUiConfig.ui_assistant_avatar;
+      if (custom) return this.$util.img(custom);
       return this.$util.img(IMAGE_CONFIG.aiAvatar);
     },
     defaultAvatar() {
       return this.$util.img(IMAGE_CONFIG.userAvatar);
     },
     aiAvatarUrl() {
+      const custom = this.chatUiConfig && this.chatUiConfig.ui_assistant_avatar;
+      if (custom) return this.$util.img(custom);
       return this.$util.img(IMAGE_CONFIG.aiAvatar);
     },
     chatMessagesStyle() {
@@ -2316,7 +2333,10 @@ _handleStreamError(msg) {
       return html
     },
     
-    // 格式化时间（人性化显示）
+    // PR-CHAT-UI-CONFIG-V3 (2026-09-24): 时间格式化支持后端配置
+    //   ui_time_format = 'auto'  智能分段(默认, 与历史行为一致): 今天 HH:mm / 昨天 / 前天 / 本年 M/D / 跨年 Y/M/D
+    //   ui_time_format = 'full'  始终完整 YYYY-MM-DD HH:mm
+    //   ui_time_humanize = true  微信式相对时间(优先于 format): 刚刚 / N分钟前 / N小时前 / 昨天 / 前天 / M月D日 / Y年M月D日
     formatTime(timestamp) {
       if (!timestamp) return '';
 
@@ -2352,6 +2372,19 @@ _handleStreamError(msg) {
       const minutes = date.getMinutes().toString().padStart(2, '0');
       const timeStr = `${hours}:${minutes}`;
 
+      // 人性化相对时间 (开启后优先于 ui_time_format)
+      if (this.chatUiConfig && this.chatUiConfig.ui_time_humanize) {
+        return this.humanizeTime(date, msgDate, today, timeStr);
+      }
+
+      // 完整时间格式: 始终 YYYY-MM-DD HH:mm
+      if (this.chatUiConfig && this.chatUiConfig.ui_time_format === 'full') {
+        const mm = (date.getMonth() + 1).toString().padStart(2, '0');
+        const dd = date.getDate().toString().padStart(2, '0');
+        return `${date.getFullYear()}-${mm}-${dd} ${timeStr}`;
+      }
+
+      // auto: 智能分段 (原有逻辑)
       if (msgDate.getTime() === today.getTime()) {
         return timeStr;
       }
@@ -2373,6 +2406,42 @@ _handleStreamError(msg) {
       const yearStr = date.getFullYear().toString();
       return `${yearStr}/${monthStr}/${dayStr} ${timeStr}`;
     },
+
+    // PR-CHAT-UI-CONFIG-V3 (2026-09-24): 微信式人性化相对时间
+    //   刚刚 / N分钟前 / 今天内N小时前 / 昨天 HH:mm / 前天 HH:mm / 本年 M月D日 HH:mm / 跨年 Y年M月D日 HH:mm
+    humanizeTime(date, msgDate, today, timeStr) {
+      const diff = Date.now() - date.getTime();
+      const oneMin = 60 * 1000;
+      const oneHour = 60 * oneMin;
+
+      if (diff >= 0 && diff < oneMin) {
+        return this.$lang('ai-chat.index.timeJustNow');
+      }
+      if (diff >= 0 && diff < oneHour) {
+        return this.$lang('ai-chat.index.timeMinutesAgo', { n: Math.floor(diff / oneMin) });
+      }
+      // 今天内且已超过 1 小时
+      if (msgDate.getTime() === today.getTime()) {
+        if (diff < 24 * oneHour) {
+          return this.$lang('ai-chat.index.timeHoursAgo', { n: Math.floor(diff / oneHour) });
+        }
+        return timeStr; // 兜底(理论不可达: 同一天 diff 不可能 >= 24h)
+      }
+      const yesterday = new Date(today.getTime() - 24 * 60 * 60 * 1000);
+      if (msgDate.getTime() === yesterday.getTime()) {
+        return `${this.$lang('ai-chat.index.timeFormatYesterday')} ${timeStr}`;
+      }
+      const beforeYesterday = new Date(today.getTime() - 2 * 24 * 60 * 60 * 1000);
+      if (msgDate.getTime() === beforeYesterday.getTime()) {
+        return `${this.$lang('ai-chat.index.timeFormatBeforeYesterday')} ${timeStr}`;
+      }
+      const m = date.getMonth() + 1;
+      const d = date.getDate();
+      if (date.getFullYear() === new Date().getFullYear()) {
+        return `${this.$lang('ai-chat.index.timeMonthDay', { m, d })} ${timeStr}`;
+      }
+      return `${this.$lang('ai-chat.index.timeYearMonthDay', { y: date.getFullYear(), m, d })} ${timeStr}`;
+    },
     
     // 格式化文件大小
     formatFileSize(bytes) {