feat: 完善协议缴费分期、样本编码搜索与鸿蒙附件选择

支持移动端样本编码远程关键字检索、分期起始日刷新与鸿蒙微信附件选取，并同步收款账户选择、角色页与相关设计文档。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_market_support_api.py

@@ -442,6 +442,79 @@ def test_protocol_form_options_filter_sample_codes_by_code_filter():
     assert 'OTHER-002' in codes
 
 
+def test_protocol_form_options_search_sample_codes_by_keyword():
+    """弹窗输入的编码走 keyword，并仍受样本类型 codeFilter 约束，不受最新 100 条截断。"""
+    from datetime import datetime, timedelta
+
+    from app.services.market_support import get_form_options
+
+    db = _session()
+    _seed_options(db)
+    base = datetime(2020, 1, 1)
+    db.add(
+        BizSampleCode(
+            id='sample-code-target',
+            sample_code='ZKZX34000987',
+            tenant_no='tenant-a',
+            create_dept_id='',
+            del_flag=0,
+            create_time=base,
+        )
+    )
+    db.add(
+        BizSampleCode(
+            id='sample-code-other-hit',
+            sample_code='OTHER34000987',
+            tenant_no='tenant-a',
+            create_dept_id='',
+            del_flag=0,
+            create_time=base + timedelta(days=400),
+        )
+    )
+    db.add_all(
+        [
+            BizSampleCode(
+                id=f'sample-code-new-{index}',
+                sample_code=f'ZKZXN{index:05d}',
+                tenant_no='tenant-a',
+                create_dept_id='',
+                del_flag=0,
+                create_time=base + timedelta(days=index + 1),
+            )
+            for index in range(201)
+        ]
+    )
+    db.commit()
+
+    hidden = get_form_options(
+        db,
+        module='protocol',
+        ctx=_ctx('manager', 'user-b'),
+        user_info=_user('user-b'),
+        region_id='rb',
+        code_filter='ZKZX',
+    )
+    hidden_codes = {item['sampleCode'] for item in hidden['sampleCodes']}
+    assert 'ZKZX34000987' not in hidden_codes
+
+    found = get_form_options(
+        db,
+        module='protocol',
+        ctx=_ctx('manager', 'user-b'),
+        user_info=_user('user-b'),
+        region_id='rb',
+        code_filter='ZKZX',
+        sample_code_keyword='34000987',
+    )
+    assert found['sampleCodes'] == [
+        {
+            'value': 'sample-code-target',
+            'label': 'ZKZX34000987',
+            'sampleCode': 'ZKZX34000987',
+        }
+    ]
+
+
 def test_protocol_form_options_hide_occupied_sample_codes():
     from app.services.market_support import get_form_options