报价缺价文案提成具名常量

- src/components/image-editor/model3d-generation/Model3dGenerationFormModel.ts：底价缺失与加价项缺失两句文案按模块既有约定提成 MODEL3D_PRICING_MISSING_BASE_PRICE_REASON 与 resolveModel3dPricingMissingAddOnReason，不再散落在计算路径里

src/components/image-editor/model3d-generation/Model3dGenerationFormModel.ts

@@ -46,6 +46,13 @@ export function isModel3dGenerationMode(
 export const MODEL3D_GENERATION_DIALOG_LABEL = '3D 模型生成';
 export const MODEL3D_GENERATION_SUBMIT_LABEL = '生成 3D 模型';
 export const MODEL3D_PRICING_UNAVAILABLE_REASON = '3D 模型定价尚未配置';
+/** 当前模型版本在这个端点没有底价：与「整段没配」分开说，用户才知道该改哪里。 */
+export const MODEL3D_PRICING_MISSING_BASE_PRICE_REASON =
+  '3D 模型定价缺少该档位底价';
+/** 某个加价项缺价：报价必须整项算得出来才算数，缺一项就不可提交。 */
+export function resolveModel3dPricingMissingAddOnReason(addOn: string) {
+  return `3D 模型定价缺少 ${addOn} 价格`;
+}
 /** 面板本身不是 3D 生成模式：与「定价缺失」是两回事，不能共用一句话。 */
 export const MODEL3D_MODE_UNSUPPORTED_REASON = '当前面板不是 3D 模型模式';
 
@@ -302,13 +309,16 @@ export function resolveModel3dPrice({
     params.texture ? basePriceRow?.texture : basePriceRow?.noTexture,
   );
   if (basePrice === null) {
-    return { ok: false, reason: '3D 模型定价缺少该档位底价' };
+    return { ok: false, reason: MODEL3D_PRICING_MISSING_BASE_PRICE_REASON };
   }
   let price = basePrice;
   for (const key of resolveModel3dAddOnKeys(params)) {
     const addOnPrice = readPrice(pricing.addOnPrices?.[key]);
     if (addOnPrice === null) {
-      return { ok: false, reason: `3D 模型定价缺少 ${key} 价格` };
+      return {
+        ok: false,
+        reason: resolveModel3dPricingMissingAddOnReason(key),
+      };
     }
     price += addOnPrice;
   }