feat: unified gravity system - VIP members consume gravity instead of unlimited; add monthly gravity top-up cron

backend/src/modules/admin/admin.controller.ts

@@ -113,7 +113,7 @@ export class AdminController {
     expireAt.setDate(expireAt.getDate() + (pricing.plans?.growth?.durationDays || VIP_DURATION_DAYS))
     user.plan = 'growth'
     user.vipExpireAt = expireAt
-    await this.quotaService.setPlanQuota(targetUserId, 'growth', credits)
+    await this.quotaService.setPlanQuota(targetUserId, pricing.plans?.growth?.gravityPerMonth || 250)
     return { success: true, plan: 'growth', expireAt }
   }
 
@@ -122,7 +122,7 @@ export class AdminController {
     if (!userId || !type || amount === undefined) {
       throw new HttpException('参数不完整', HttpStatus.BAD_REQUEST)
     }
-    const validTypes = ['interviewCredits', 'resumeOptimizeCredits', 'resumeDownloadCredits', 'shareCredits']
+    const validTypes = ['interviewCredits', 'resumeOptimizeCredits', 'resumeDownloadCredits', 'shareCredits', 'gravity']
     if (!validTypes.includes(type)) {
       throw new HttpException('无效的额度类型', HttpStatus.BAD_REQUEST)
     }
@@ -291,18 +291,18 @@ export class AdminController {
           } else {
             user.vipExpireAt = expireAt
           }
-          await this.quotaService.setPlanQuota(order.userId, planId, credits)
+          await this.quotaService.setPlanQuota(order.userId, planCfg.gravityPerMonth)
         }
       } else {
         const pricing = await this.pricingService.getConfig()
-        const creditMap: Record<string, number> = {
-          interview: pricing.interview?.creditsPerPurchase || 1,
-          optimize: pricing.resumeOptimize?.creditsPerPurchase || 1,
-          download: pricing.resumeDownload?.creditsPerPurchase || 1,
+        const gravityMap: Record<string, number> = {
+          interview: pricing.gravityRates?.interviewPerUse || 5,
+          optimize: pricing.gravityRates?.optimizePerUse || 3,
+          download: pricing.gravityRates?.downloadPerUse || 2,
         }
-        const credits = creditMap[order.type]
-        if (credits) {
-          await this.quotaService.grantCredits(order.userId, order.type as any, credits)
+        const g = gravityMap[order.type]
+        if (g) {
+          await this.quotaService.grantGravity(order.userId, g)
         }
       }
     }