fix: support manual FBA quote fallback

firstleg/src/main/resources/openapi/fba-pricing-v1.yaml

@@ -154,6 +154,13 @@ paths:
       parameters: [{$ref: '#/components/parameters/TenantId'}, {$ref: '#/components/parameters/InboundId'}, {$ref: '#/components/parameters/IdempotencyKey'}]
       requestBody: {content: {application/json: {schema: {$ref: '#/components/schemas/CalculateRequest'}}}}
       responses: {'200': {description: 成功或业务失败, content: {application/json: {schema: {$ref: '#/components/schemas/FeeSnapshotApiResponse'}}}}, '403': {description: 无权限}}
+  /api/platform/v1/inbounds/{inboundId}/fees/manual-quote:
+    post:
+      summary: FBA价格未命中时人工确定头程单价
+      description: 仅FBA且价格查询返回未命中时可用；按客户计费方式与选定测量重量、体积计算计费量，附加费为零。生成正式头程费用快照，后续复用确认与发送；需要 firstleg:inbound:confirm-send-fee 权限。
+      parameters: [{$ref: '#/components/parameters/TenantId'}, {$ref: '#/components/parameters/InboundId'}, {$ref: '#/components/parameters/IdempotencyKey'}]
+      requestBody: {required: true, content: {application/json: {schema: {$ref: '#/components/schemas/ManualQuoteRequest'}}}}
+      responses: {'200': {description: 成功或业务失败, content: {application/json: {schema: {$ref: '#/components/schemas/FeeSnapshotApiResponse'}}}}, '403': {description: 无权限}}
   /api/platform/v1/inbounds/{inboundId}/fees/confirm:
     post:
       summary: 确认最新费用快照
@@ -488,6 +495,14 @@ components:
         additionalAmount: {type: number, minimum: 0, multipleOf: 0.01}
         reason: {type: string, minLength: 1, maxLength: 500}
         toleranceConfirmed: {type: boolean, enum: [true], description: 前端展示上下界并由操作员二次确认后固定传true；服务端仍会重新校验范围与版本}
+    ManualQuoteRequest:
+      type: object
+      required: [selectedWeightKg, selectedVolumeCbm, unitPrice, reason]
+      properties:
+        selectedWeightKg: {type: number, exclusiveMinimum: true, minimum: 0}
+        selectedVolumeCbm: {type: number, exclusiveMinimum: true, minimum: 0}
+        unitPrice: {type: number, exclusiveMinimum: true, minimum: 0}
+        reason: {type: string, minLength: 2, maxLength: 500}
     CalculateRequest:
       type: object
       properties: