refactor(server): 单号规则收紧为 A/R/D+8 位紧凑格式

- DOCUMENT_NUMBER_PREFIXES 改为 A/R/D，新增短格式与旧格式正则并存识别，提取正则加边界锚定避免误匹配
- build_document_number 去掉时间戳段，统一生成 A+token 等紧凑单号，is_application_claim_no 兼容旧 AP-/APP- 前缀
- access_policy/status_registry/reimbursements/expense_claims/budget_support 统一复用 is_application_claim_no 判定申请单
- 同步 document_numbering 单元测试覆盖新旧两种格式

server/tests/test_document_numbering.py

@@ -11,6 +11,8 @@ from sqlalchemy.pool import StaticPool
 from app.db.base import Base
 from app.models.financial_record import ExpenseClaim
 from app.services.document_numbering import (
+    DOCUMENT_NUMBER_EXTRACT_PATTERN,
+    DOCUMENT_NUMBER_PATTERN,
     build_document_number,
     generate_unique_expense_claim_no,
     is_application_claim_no,
@@ -32,19 +34,37 @@ def test_build_document_number_uses_kind_prefix_timestamp_and_token() -> None:
     timestamp = datetime(2026, 5, 25, 10, 30, 45, tzinfo=UTC)
 
     assert (
-        build_document_number("application", timestamp=timestamp, token="ABCDEFGH")
-        == "AP-20260525103045-ABCDEFGH"
+        build_document_number("application", timestamp=timestamp, token="7K3M9Q2P")
+        == "A7K3M9Q2P"
     )
     assert (
-        build_document_number("reimbursement", timestamp=timestamp, token="ABCDEFGH")
-        == "RE-20260525103045-ABCDEFGH"
+        build_document_number("reimbursement", timestamp=timestamp, token="7K3M9Q2P")
+        == "R7K3M9Q2P"
     )
     assert (
-        build_document_number("audit", timestamp=timestamp, token="ABCDEFGH")
-        == "AD-20260525103045-ABCDEFGH"
+        build_document_number("audit", timestamp=timestamp, token="7K3M9Q2P")
+        == "D7K3M9Q2P"
     )
 
 
+def test_document_number_pattern_accepts_short_and_legacy_numbers() -> None:
+    assert DOCUMENT_NUMBER_PATTERN.fullmatch("A7K3M9Q2P")
+    assert DOCUMENT_NUMBER_PATTERN.fullmatch("R7K3M9Q2P")
+    assert DOCUMENT_NUMBER_PATTERN.fullmatch("D7K3M9Q2P")
+    assert DOCUMENT_NUMBER_PATTERN.fullmatch("AP-20260525103045-ABCDEFGH")
+    assert DOCUMENT_NUMBER_PATTERN.fullmatch("RE-20260525103045-HGFEDCBA")
+
+
+def test_document_number_extract_pattern_finds_short_and_legacy_numbers() -> None:
+    query = "查看 A7K3M9Q2P、R7K3M9Q2P 和 AP-20260525103045-ABCDEFGH 的状态"
+
+    assert [match.group(0) for match in DOCUMENT_NUMBER_EXTRACT_PATTERN.finditer(query)] == [
+        "A7K3M9Q2P",
+        "R7K3M9Q2P",
+        "AP-20260525103045-ABCDEFGH",
+    ]
+
+
 def test_build_document_number_rejects_ambiguous_token_chars() -> None:
     timestamp = datetime(2026, 5, 25, 10, 30, 45, tzinfo=UTC)
 
@@ -57,7 +77,7 @@ def test_generate_unique_expense_claim_no_retries_existing_candidate() -> None:
     with build_session() as db:
         db.add(
             ExpenseClaim(
-                claim_no="RE-20260525103045-ABCDEFGH",
+                claim_no="RABCDEFGH",
                 employee_name="张三",
                 department_name="市场部",
                 project_code=None,
@@ -84,11 +104,13 @@ def test_generate_unique_expense_claim_no_retries_existing_candidate() -> None:
                 timestamp=timestamp,
                 token_factory=lambda: next(tokens),
             )
-            == "RE-20260525103045-HGFEDCBA"
+            == "RHGFEDCBA"
         )
 
 
 def test_is_application_claim_no_supports_new_and_legacy_prefixes() -> None:
+    assert is_application_claim_no("A7K3M9Q2P")
     assert is_application_claim_no("AP-20260525103045-ABCDEFGH")
     assert is_application_claim_no("APP-20260525-ABC123")
+    assert not is_application_claim_no("R7K3M9Q2P")
     assert not is_application_claim_no("RE-20260525103045-ABCDEFGH")