feat: 完善文档中心与报销申请交互及侧边栏重构

后端优化编排器报销查询和本体检测精度，增强报销单草稿保
存和附件回填逻辑，前端重构侧边栏组件支持折叠和图标导
航，完善文档中心状态筛选和详情提示，报销创建和审批详情
页优化会话管理和费用明细交互，新增助手应用服务和预设动
作工具函数，补充单元测试覆盖。

web/src/utils/assistantSessionScope.js

@@ -0,0 +1,173 @@
+export const ASSISTANT_SCOPE_ACTION_SWITCH = 'switch_assistant_session'
+
+export const ASSISTANT_SCOPE_SESSION_APPLICATION = 'application'
+export const ASSISTANT_SCOPE_SESSION_EXPENSE = 'expense'
+export const ASSISTANT_SCOPE_SESSION_APPROVAL = 'approval'
+export const ASSISTANT_SCOPE_SESSION_KNOWLEDGE = 'knowledge'
+
+const SESSION_SCOPE_CONFIG = {
+  [ASSISTANT_SCOPE_SESSION_APPLICATION]: {
+    label: '申请助手',
+    icon: 'mdi mdi-file-plus-outline',
+    scope: '费用申请、事前审批、申请材料清单、申请单状态查询'
+  },
+  [ASSISTANT_SCOPE_SESSION_EXPENSE]: {
+    label: '报销助手',
+    icon: 'mdi mdi-receipt-text-plus-outline',
+    scope: '发起报销、票据识别、草稿归集、报销单状态查询和报销信息核对'
+  },
+  [ASSISTANT_SCOPE_SESSION_APPROVAL]: {
+    label: '审核助手',
+    icon: 'mdi mdi-clipboard-check-outline',
+    scope: '待审单据查询、审批动作、风险解释和审核意见草稿'
+  },
+  [ASSISTANT_SCOPE_SESSION_KNOWLEDGE]: {
+    label: '财务知识助手',
+    icon: 'mdi mdi-book-open-page-variant-outline',
+    scope: '财务制度、报销标准、票据要求、流程规则和政策口径解释'
+  }
+}
+
+const SESSION_SCOPE_TYPES = Object.keys(SESSION_SCOPE_CONFIG)
+
+const APPLICATION_PATTERN =
+  /费用申请|发起申请|申请单|事前申请|事前审批|前置审批|出差申请|采购申请|用款申请|预算申请|申请材料|材料清单|先申请|立项申请/
+const EXPENSE_PATTERN =
+  /报销|报销单|票据|发票|火车票|高铁票|机票|飞机票|的士票|出租车|网约车|酒店票|住宿票|住宿单据|保存草稿|草稿|费用明细|归集|上传.*票|关联单据|继续下一步/
+const APPROVAL_PATTERN =
+  /待我审核|待审|审核|审批|审核意见|审批意见|审批通过|审批驳回|驳回|退回|审核中心|审批中心|领导审批|财务审核|处理意见/
+const KNOWLEDGE_PATTERN =
+  /制度|政策|标准|规则|规定|流程|口径|依据|上限|额度|补贴|住宿标准|差旅标准|报销标准|票据要求|可不可以|能不能|怎么规定|如何计算|怎么算/
+const EXPENSE_OPERATION_PATTERN = /发起报销|报销单|票据|发票|火车票|高铁票|机票|的士票|草稿|归集|上传|关联单据|继续下一步/
+const CURRENT_CLAIM_RISK_PATTERN = /这张|当前|本单|该单|单据|风险|超标|异常|重复|待补/
+
+function normalizeSessionType(sessionType) {
+  const normalized = String(sessionType || '').trim()
+  return SESSION_SCOPE_TYPES.includes(normalized) ? normalized : ASSISTANT_SCOPE_SESSION_EXPENSE
+}
+
+function normalizeText(rawText) {
+  return String(rawText || '')
+    .replace(/\s+/g, '')
+    .toLowerCase()
+}
+
+function resolveScopeConfig(sessionType) {
+  return SESSION_SCOPE_CONFIG[normalizeSessionType(sessionType)] || SESSION_SCOPE_CONFIG[ASSISTANT_SCOPE_SESSION_EXPENSE]
+}
+
+export function inferAssistantScopeTarget(rawText, options = {}) {
+  const text = normalizeText(rawText)
+  if (!text) {
+    return ''
+  }
+
+  const applicationMatched = APPLICATION_PATTERN.test(text)
+  const expenseMatched = EXPENSE_PATTERN.test(text)
+  const approvalMatched = APPROVAL_PATTERN.test(text)
+  const knowledgeMatched = KNOWLEDGE_PATTERN.test(text)
+
+  if (approvalMatched && /(待我审核|待审|审核意见|审批意见|审批通过|审批驳回|驳回|退回|审核中心|审批中心|处理意见)/.test(text)) {
+    return ASSISTANT_SCOPE_SESSION_APPROVAL
+  }
+
+  if (knowledgeMatched && !options.hasActiveReviewPayload && !EXPENSE_OPERATION_PATTERN.test(text)) {
+    return ASSISTANT_SCOPE_SESSION_KNOWLEDGE
+  }
+
+  if (expenseMatched && !applicationMatched) {
+    return ASSISTANT_SCOPE_SESSION_EXPENSE
+  }
+
+  if (applicationMatched && !expenseMatched) {
+    return ASSISTANT_SCOPE_SESSION_APPLICATION
+  }
+
+  if (knowledgeMatched && !expenseMatched && !approvalMatched && !applicationMatched) {
+    return ASSISTANT_SCOPE_SESSION_KNOWLEDGE
+  }
+
+  if (knowledgeMatched && !options.hasActiveReviewPayload) {
+    return ASSISTANT_SCOPE_SESSION_KNOWLEDGE
+  }
+
+  if (approvalMatched) {
+    return ASSISTANT_SCOPE_SESSION_APPROVAL
+  }
+
+  if (expenseMatched) {
+    return ASSISTANT_SCOPE_SESSION_EXPENSE
+  }
+
+  if (applicationMatched) {
+    return ASSISTANT_SCOPE_SESSION_APPLICATION
+  }
+
+  return ''
+}
+
+function shouldAllowCurrentExpensePolicyQuestion(rawText, currentSessionType, targetSessionType, options = {}) {
+  if (
+    normalizeSessionType(currentSessionType) !== ASSISTANT_SCOPE_SESSION_EXPENSE ||
+    targetSessionType !== ASSISTANT_SCOPE_SESSION_KNOWLEDGE ||
+    !options.hasActiveReviewPayload
+  ) {
+    return false
+  }
+
+  return CURRENT_CLAIM_RISK_PATTERN.test(normalizeText(rawText))
+}
+
+function buildScopeSwitchAction(targetSessionType, rawText, options = {}) {
+  const target = resolveScopeConfig(targetSessionType)
+  const carryText = String(rawText || '').trim()
+
+  return {
+    label: `切换到${target.label}`,
+    description: `带着这条内容进入${target.label}继续处理`,
+    icon: target.icon,
+    action_type: ASSISTANT_SCOPE_ACTION_SWITCH,
+    payload: {
+      session_type: normalizeSessionType(targetSessionType),
+      carry_text: carryText,
+      carry_files: Boolean(options.attachmentCount)
+    }
+  }
+}
+
+function buildScopeBoundaryText(currentSessionType, targetSessionType) {
+  const current = resolveScopeConfig(currentSessionType)
+  const target = resolveScopeConfig(targetSessionType)
+
+  return [
+    `我先暂停在「${current.label}」里继续处理这条消息。`,
+    '',
+    `当前助手的业务范围是：${current.scope}。`,
+    '',
+    `您这条内容更适合交给「${target.label}」处理；它的业务范围是：${target.scope}。`,
+    '',
+    `建议切换到「${target.label}」后继续，我会尽量把这条内容带过去，避免在错误的会话里把流程跑偏。`
+  ].join('\n')
+}
+
+export function resolveAssistantScopeGuard(rawText, currentSessionType, options = {}) {
+  const normalizedCurrent = normalizeSessionType(currentSessionType)
+  const targetSessionType = inferAssistantScopeTarget(rawText, options)
+  if (!targetSessionType || targetSessionType === normalizedCurrent) {
+    return null
+  }
+
+  if (shouldAllowCurrentExpensePolicyQuestion(rawText, normalizedCurrent, targetSessionType, options)) {
+    return null
+  }
+
+  const target = resolveScopeConfig(targetSessionType)
+
+  return {
+    targetSessionType,
+    targetLabel: target.label,
+    text: buildScopeBoundaryText(normalizedCurrent, targetSessionType),
+    meta: [`建议切换至${target.label}`],
+    suggestedActions: [buildScopeSwitchAction(targetSessionType, rawText, options)]
+  }
+}