feat: 扩展 AI 记账能力并优化收支记录交互

- AI 能力：新增分类 Emoji 推荐、标签颜色推荐、自然语言生成分类/标签、单条记录分类推荐

- AI 批量建议：按类型+支付方式+备注去重聚合后分批调用，支持分类/标签/两者范围并记忆偏好，结果可勾选应用

- 分类/标签管理：新增 EmojiPicker 与预设色板，支持 AI 一键推荐并在列表可视化

- 收支记录：新增序号列，标签筛选支持无标签，编辑记录时允许不设置分类

- 修复：账单导入未选择默认标签时生成空 IN 列表导致的 SQL 语法错误

- AI 未启用时隐藏所有 AI 入口与弹窗

frontend/src/locales/messages.ts

@@ -150,6 +150,7 @@ export default {
     pageIncome: { zh: '本页收入', en: 'Page Income' },
     pageBalance: { zh: '本页结余', en: 'Page Balance' },
     column: {
+      index: { zh: '序号', en: 'No.' },
       transactionTime: { zh: '交易时间', en: 'Time' },
       type: { zh: '类型', en: 'Type' },
       category: { zh: '分类', en: 'Category' },
@@ -162,6 +163,7 @@ export default {
     },
     notIncluded: { zh: '不计入', en: 'Excluded' },
     uncategorized: { zh: '未分类', en: 'Uncategorized' },
+    untagged: { zh: '无标签', en: 'Untagged' },
     remarkHidden: { zh: '备注已隐藏', en: 'Remark hidden' },
     remarkView: { zh: '查看', en: 'View' },
     remarkHide: { zh: '隐藏', en: 'Hide' },
@@ -228,7 +230,9 @@ export default {
     namePlaceholder: { zh: '请输入分类名称', en: 'Enter category name' },
     type: { zh: '类型', en: 'Type' },
     icon: { zh: '图标', en: 'Icon' },
-    iconPlaceholder: { zh: '可选，如 emoji', en: 'Optional, e.g. emoji' },
+    iconPlaceholder: { zh: '点击选择 Emoji', en: 'Click to pick an emoji' },
+    emojiInputPlaceholder: { zh: '自定义输入 Emoji 或文字', en: 'Custom emoji or text' },
+    clearIcon: { zh: '清除图标', en: 'Clear icon' },
     sort: { zh: '排序', en: 'Order' },
     nameRequired: { zh: '请输入分类名称', en: 'Please enter a category name' },
     deleteConfirm: { zh: '确定要删除这个分类吗？', en: 'Are you sure you want to delete this category?' },
@@ -326,15 +330,57 @@ export default {
     testSuccess: { zh: '连接成功', en: 'Connection succeeded' },
     testFailed: { zh: '连接失败', en: 'Connection failed' },
     suggestButton: { zh: 'AI 智能建议', en: 'AI suggestions' },
+    pickButton: { zh: 'AI 推荐', en: 'AI Pick' },
+    scope: {
+      label: { zh: '建议内容', en: 'Scope' },
+      both: { zh: '分类与标签', en: 'Category & Tags' },
+      category: { zh: '仅分类', en: 'Category only' },
+      tag: { zh: '仅标签', en: 'Tags only' },
+    },
     suggestTitle: { zh: 'AI 分类与标签建议', en: 'AI category & tag suggestions' },
     suggesting: { zh: '正在分析，请稍候…', en: 'Analyzing, please wait…' },
     suggestFailed: { zh: 'AI 建议生成失败', en: 'Failed to generate AI suggestions' },
     noSuggestion: { zh: 'AI 未返回有效建议', en: 'AI returned no valid suggestions' },
-    applyAll: { zh: '全部应用（{count}）', en: 'Apply all ({count})' },
+    applyAll: { zh: '应用勾选（{count}）', en: 'Apply selected ({count})' },
+    applyNone: { zh: '请至少勾选一条建议', en: 'Please select at least one suggestion' },
+    aggregated: { zh: '已聚合为 {groups} 类、共 {count} 条记录', en: 'Aggregated into {groups} groups, {count} records in total' },
     applySuccess: { zh: '已应用 {count} 条建议', en: 'Applied {count} suggestions' },
+    oneApplied: { zh: '已应用 AI 推荐分类', en: 'AI category applied' },
+    tagApplied: { zh: '已应用 AI 推荐标签', en: 'AI tags applied' },
     applyFailed: { zh: '应用建议失败', en: 'Failed to apply suggestions' },
     applyHint: { zh: '将覆盖分类并追加标签，确认后立即写入', en: 'Categories will be overwritten and tags appended; changes are written immediately.' },
     needConfig: { zh: 'AI 未启用，请先在「AI 设置」中配置', en: 'AI is not enabled. Please configure it in AI Settings first.' },
+    decorate: {
+      emojiButton: { zh: 'AI 推荐', en: 'AI Pick' },
+      colorButton: { zh: 'AI 推荐', en: 'AI Pick' },
+      nameRequired: { zh: '请先输入名称', en: 'Please enter a name first' },
+      failed: { zh: 'AI 推荐失败', en: 'AI recommendation failed' },
+    },
+    category: {
+      label: { zh: 'AI 生成分类', en: 'AI Category' },
+      placeholder: { zh: '描述用途，如：日常通勤打车地铁', en: 'Describe it, e.g. daily commute by taxi and metro' },
+      button: { zh: 'AI 生成', en: 'Generate' },
+      textRequired: { zh: '请输入分类描述', en: 'Please enter a description' },
+      applied: { zh: '已生成分类，请确认后保存', en: 'Category generated, please confirm and save' },
+      failed: { zh: 'AI 生成分类失败', en: 'Failed to generate category' },
+    },
+    newCategory: {
+      button: { zh: 'AI 新建', en: 'AI New' },
+      hint: { zh: 'AI 建议新分类：', en: 'AI suggests:' },
+      save: { zh: '保存并选用', en: 'Save & Select' },
+      saved: { zh: '已创建并选用新分类', en: 'Category created and selected' },
+      exists: { zh: '已存在同名分类，已为你选中', en: 'A same-name category exists and has been selected' },
+      needInfo: { zh: '请先填写备注或金额，便于生成分类', en: 'Please fill in a remark or amount first' },
+    },
+    newTag: {
+      button: { zh: 'AI 新建', en: 'AI New' },
+      hint: { zh: 'AI 建议新标签：', en: 'AI suggests tag:' },
+      save: { zh: '保存并选用', en: 'Save & Select' },
+      saved: { zh: '已创建并选用新标签', en: 'Tag created and selected' },
+      exists: { zh: '已存在同名标签，已为你选中', en: 'A same-name tag exists and has been selected' },
+      needInfo: { zh: '请先填写备注或金额，便于生成标签', en: 'Please fill in a remark or amount first' },
+      failed: { zh: 'AI 生成标签失败', en: 'Failed to generate tag' },
+    },
     query: {
       placeholder: { zh: '用自然语言查询，如：上个月餐饮花了多少', en: 'Ask in natural language, e.g. dining expenses last month' },
       examples: { zh: '上个月餐饮|超过500的支出|待报销的支出|微信支付', en: 'Dining last month|Expenses over 500|Pending reimbursement|Paid by WeChat' },
@@ -369,6 +415,7 @@ export default {
     },
     column: {
       record: { zh: '记录', en: 'Record' },
+      count: { zh: '命中条数', en: 'Matched' },
       category: { zh: '建议分类', en: 'Suggested category' },
       tags: { zh: '建议标签', en: 'Suggested tags' },
       reason: { zh: '理由', en: 'Reason' },
@@ -390,6 +437,8 @@ export default {
       empty: { zh: '暂无调用记录', en: 'No usage records yet' },
       type: {
         suggest: { zh: '生成建议', en: 'Suggest' },
+        decorate: { zh: '图标配色', en: 'Icon & Color' },
+        category: { zh: '生成分类', en: 'Category' },
         test: { zh: '测试连接', en: 'Test' },
       },
       column: {