feat: 增强差旅报销审核流程与票据智能推理

优化本体解析和编排器的差旅场景处理能力，完善报销单草稿
保存和费用明细同步逻辑，前端报销创建页面增加行程推理和
票据审核交互，新增助手会话快照工具函数，补充单元测试。

server/src/app/services/document_intelligence.py

@@ -177,8 +177,8 @@ SUPPORTED_DOCUMENT_TYPES = tuple(DOCUMENT_TYPE_RULE_MAP.keys()) + ("other",)
 
 AMOUNT_PATTERNS = (
     re.compile(
-        r"(?:价税合计|合计金额|费用合计|订单(?:总)?金额|支付(?:金额)?|实付(?:金额)?|实收(?:金额)?|总(?:额|计|价)|票价|金额|车费|消费金额)"
-        r"[：:\s￥¥人民币]*([0-9]+(?:[.,][0-9]{1,2})?)"
+        r"(?:价税合计|合计金额|费用合计|总费用|费用总计|订单(?:总)?金额|支付(?:金额)?|实付(?:金额)?|实收(?:金额)?|总(?:额|计|价)|票价|金额|车费|消费金额|房费|住宿费)"
+        r"[：:\s￥¥人民币为是]*([0-9]+(?:[.,][0-9]{1,2})?)"
     ),
     re.compile(r"[￥¥]\s*([0-9]+(?:[.,][0-9]{1,2})?)"),
     re.compile(r"([0-9]+(?:[.,][0-9]{1,2})?)\s*元"),
@@ -721,6 +721,8 @@ def _extract_amount(text: str) -> str:
                 continue
             if candidate <= Decimal("0.00"):
                 continue
+            if _is_amount_match_date_fragment(candidate, text, match.start(1), match.end(1)):
+                continue
             if best_value is None or candidate > best_value:
                 best_value = candidate
 
@@ -731,6 +733,22 @@ def _extract_amount(text: str) -> str:
     return f"{text_value}元"
 
 
+def _is_amount_match_date_fragment(amount: Decimal, text: str, start: int, end: int) -> bool:
+    if start < 0 or end < 0:
+        return False
+    normalized = amount.quantize(Decimal("0.01"))
+    if normalized != normalized.to_integral_value() or normalized < Decimal("1900") or normalized > Decimal("2099"):
+        return False
+
+    before = str(text or "")[max(0, start - 8):start]
+    after = str(text or "")[end:end + 10]
+    if re.match(r"\s*(?:年|[-/.])\s*\d{1,2}", after):
+        return True
+    if re.search(r"\d{1,2}\s*(?:年|[-/.])\s*$", before):
+        return True
+    return False
+
+
 def _extract_date(text: str, *, document_type: str = "") -> str:
     matches = list(DATE_PATTERN.finditer(text))
     if not matches: