```

refactor: 移除审批和回写功能模块

移除了整个审批(approvals)和官方回写(writebacks)功能模块，
包括相关模型、路由、服务和配置项。更新了数据库迁移文件，
删除了相关的审批请求表和官方回写运行表。同时从API路由器中
移除了相应的路由，并调整了安全常量和字段验证器以匹配变更。
```

app/modules/feishu/service.py

@@ -14,9 +14,6 @@ from app.modules.feishu.constants import (
     FEISHU_EMPTY_CARD_TEXT,
     FEISHU_INVALID_TOKEN,
     FEISHU_VERIFICATION_TOKEN_REQUIRED,
-    FeishuApprovalAction,
-    FeishuApprovalValueKey,
-    FeishuCardKey,
     FeishuPayloadKey,
     FeishuReceiveIdType,
 )
@@ -112,43 +109,3 @@ class FeishuService:
                 }
             ],
         }
-
-    @staticmethod
-    def build_approval_card(
-        title: str,
-        lines: list[str],
-        ticket_id: str,
-    ) -> dict[str, Any]:
-        card = FeishuService.build_basic_card(title, lines)
-        card[FeishuPayloadKey.ELEMENTS].append(
-            {
-                FeishuPayloadKey.TAG: FeishuApprovalValueKey.ACTION,
-                FeishuCardKey.ACTIONS: [
-                    {
-                        FeishuPayloadKey.TAG: "button",
-                        FeishuPayloadKey.TEXT: {
-                            FeishuPayloadKey.TAG: FeishuPayloadKey.PLAIN_TEXT,
-                            FeishuPayloadKey.CONTENT: "批准",
-                        },
-                        FeishuCardKey.BUTTON_TYPE: "primary",
-                        FeishuCardKey.VALUE: {
-                            FeishuApprovalValueKey.TICKET_ID: ticket_id,
-                            FeishuApprovalValueKey.DECISION: FeishuApprovalAction.APPROVE,
-                        },
-                    },
-                    {
-                        FeishuPayloadKey.TAG: "button",
-                        FeishuPayloadKey.TEXT: {
-                            FeishuPayloadKey.TAG: FeishuPayloadKey.PLAIN_TEXT,
-                            FeishuPayloadKey.CONTENT: "拒绝",
-                        },
-                        FeishuCardKey.BUTTON_TYPE: "danger",
-                        FeishuCardKey.VALUE: {
-                            FeishuApprovalValueKey.TICKET_ID: ticket_id,
-                            FeishuApprovalValueKey.DECISION: FeishuApprovalAction.REJECT,
-                        },
-                    },
-                ],
-            }
-        )
-        return card