feat: registration gravity from DB config instead of hardcoded

- Add registrationGravity to pricing config (default 50, adjustable via admin)
- Inject PricingService into UserService, read config for all 4 registration paths
- Expose registrationGravity in /member/plans response for frontend
- Login page fetches dynamic value from API, replaces hardcoded '50'
- Update user.vue gravity card copy

backend/src/modules/member/member.controller.ts

@@ -53,6 +53,7 @@ export class MemberController {
     }
 
     return {
+      registrationGravity: pricing.registrationGravity,
       interview: { dailyFreeLimit: FREE_DAILY_LIMIT, maxRoundsFree: 5, maxRoundsVip: 10 },
       gravityRates: pricing.gravityRates,
       products: {

backend/src/modules/schemas/pricing.service.ts

@@ -10,6 +10,8 @@ export interface GravityRates {
 }
 
 interface PricingConfig {
+  /** 新用户注册赠送引力值 */
+  registrationGravity: number
   interview: { pricePerSession: number; creditsPerPurchase: number }
   resumeOptimize: { freeLimit: number; pricePerOptimize: number; creditsPerPurchase: number }
   resumeDownload: { pricePerDownload: number; creditsPerPurchase: number }
@@ -21,6 +23,7 @@ interface PricingConfig {
 }
 
 const DEFAULT_PRICING: PricingConfig = {
+  registrationGravity: 50,
   interview: { pricePerSession: 600, creditsPerPurchase: 1 },
   resumeOptimize: { freeLimit: 3, pricePerOptimize: 400, creditsPerPurchase: 1 },
   resumeDownload: { pricePerDownload: 200, creditsPerPurchase: 1 },
@@ -62,6 +65,7 @@ export class PricingService {
 
   private mergeDefaults(value: any): PricingConfig {
     return {
+      registrationGravity: value?.registrationGravity ?? DEFAULT_PRICING.registrationGravity,
       interview: { ...DEFAULT_PRICING.interview, ...value?.interview },
       resumeOptimize: { ...DEFAULT_PRICING.resumeOptimize, ...value?.resumeOptimize },
       resumeDownload: { ...DEFAULT_PRICING.resumeDownload, ...value?.resumeDownload },

backend/src/modules/user/user.service.ts

@@ -5,6 +5,7 @@ import { Model } from 'mongoose'
 import { JwtService } from '@nestjs/jwt'
 import { User, UserDocument } from './user.schema'
 import { EmailService } from '../email/email.service'
+import { PricingService } from '../schemas/pricing.service'
 
 /** 通过 IP 查询粗略地理位置（ip-api.com 免费接口） */
 async function lookupIpLocation(ip: string): Promise<string> {
@@ -30,6 +31,7 @@ export class UserService {
     @InjectModel(User.name) private userModel: Model<UserDocument>,
     private jwtService: JwtService,
     private emailService: EmailService,
+    private pricingService: PricingService,
   ) {}
 
   async sendCode(phone: string) {
@@ -58,7 +60,7 @@ export class UserService {
 
     let user = await this.userModel.findOne({ phone }).exec()
     if (!user) {
-      user = await this.userModel.create({ phone, nickname: `用户${phone.slice(-4)}`, gravity: 5 })
+      user = await this.userModel.create({ phone, nickname: `用户${phone.slice(-4)}`, gravity: (await this.pricingService.getConfig()).registrationGravity })
     }
 
     await this.recordLogin(user._id.toString(), ip)
@@ -94,7 +96,7 @@ export class UserService {
 
     let user = await this.userModel.findOne({ wxOpenid: openid }).exec()
     if (!user) {
-      user = await this.userModel.create({ wxOpenid: openid, nickname: '微信用户', gravity: 5 })
+      user = await this.userModel.create({ wxOpenid: openid, nickname: '微信用户', gravity: (await this.pricingService.getConfig()).registrationGravity })
     }
 
     await this.recordLogin(user._id.toString(), ip)
@@ -170,7 +172,7 @@ export class UserService {
     if (!user) {
       isNew = true
       const nick = email.split('@')[0]
-      user = await this.userModel.create({ email, nickname: nick, remaining: 0, gravity: 5 })
+      user = await this.userModel.create({ email, nickname: nick, remaining: 0, gravity: (await this.pricingService.getConfig()).registrationGravity })
     }
     await this.recordLogin(user._id.toString(), ip)
     return { ...this.generateAuthResponse(user), isNew, hasPassword: !!user.password }
@@ -208,7 +210,7 @@ export class UserService {
     }
     const nick = email.split('@')[0]
     const hashed = await bcrypt.hash(password, 10)
-    const user = await this.userModel.create({ email, nickname: nick, password: hashed, remaining: 0, gravity: 5 })
+    const user = await this.userModel.create({ email, nickname: nick, password: hashed, remaining: 0, gravity: (await this.pricingService.getConfig()).registrationGravity })
     await this.recordLogin(user._id.toString(), ip)
     return this.generateAuthResponse(user)
   }

zhiyin-app/src/pages/login/login.vue

@@ -65,6 +65,13 @@
       <view class="card" v-if="mainTab === 'register'">
         <text class="card-title">创建账号</text>
         <text class="card-sub">注册后享受 AI 面试模拟服务</text>
+        <view class="promo-banner">
+          <text class="promo-icon">🎁</text>
+          <view class="promo-texts">
+            <text class="promo-title">注册即送 {{ registrationGravity }} 引力值</text>
+            <text class="promo-desc">免费体验 AI 面试模拟</text>
+          </view>
+        </view>
         <view class="field">
           <text class="field-label">邮箱</text>
           <input class="input" type="text" v-model="email" placeholder="请输入邮箱" />
@@ -133,6 +140,7 @@ const agreed = ref(false)
 const mainTab = ref('login')
 const loginMode = ref('password') // 'password' | 'code'
 const isMp = ref(false)
+const registrationGravity = ref(50)
 
 const email = ref('')
 const password = ref('')
@@ -158,6 +166,17 @@ onMounted(() => {
   isMp.value = true
   mainTab.value = 'wechat'
   // #endif
+  // 获取注册赠送引力值配置
+  uni.request({
+    url: api('/member/plans'),
+    method: 'GET',
+    success: (res) => {
+      if (res.statusCode === 200 && res.data?.registrationGravity) {
+        registrationGravity.value = res.data.registrationGravity
+      }
+    },
+    fail: () => {} // 使用默认值 50
+  })
 })
 
 onBeforeUnmount(() => { if (timer) { clearTimeout(timer); timer = null } })
@@ -355,6 +374,12 @@ const goPrivacy = () => uni.navigateTo({ url: '/pages/privacy/privacy' })
 .card-title { font-size: 30rpx; font-weight: 700; color: var(--color-text); display: block; }
 .card-sub { font-size: 22rpx; color: var(--color-text-tertiary); margin-top: 6rpx; margin-bottom: 24rpx; display: block; }
 
+/* ===== Promo Banner ===== */
+.promo-banner { background: linear-gradient(135deg, #FEF3C7, #FDE68A); border-radius: var(--radius-md); padding: 20rpx 24rpx; margin-bottom: 24rpx; display: flex; align-items: center; gap: 16rpx; }
+.promo-icon { font-size: 36rpx; }
+.promo-title { font-size: 26rpx; font-weight: 700; color: #92400E; display: block; }
+.promo-desc { font-size: 22rpx; color: #B45309; display: block; margin-top: 4rpx; }
+
 /* ===== Fields ===== */
 .field { margin-bottom: 20rpx; }
 .field-label { font-size: 22rpx; color: var(--color-text-secondary); margin-bottom: 8rpx; display: block; }

zhiyin-app/src/pages/user/user.vue

@@ -49,7 +49,7 @@
             </view>
             <text class="gravity-num">{{ memberInfo.gravity ?? 0 }}</text>
           </view>
-          <text class="gravity-hint">每次面试消耗 5 引力值 · 分享可获得更多</text>
+          <text class="gravity-hint">每次面试消耗 5 引力值 · 分享好友、贡献面经可获得更多</text>
         <view class="gravity-actions">
           <text class="gravity-btn share" @click="goSharePage">分享得引力值</text>
           <text class="gravity-btn contribute" @click="goContributePage">贡献面经</text>
@@ -150,7 +150,7 @@
           <view class="gp-method-icon-wrap"><text class="gp-method-icon">🛒</text></view>
           <view class="gp-method-info">
             <text class="gp-method-name">购买引力值</text>
-            <text class="gp-method-desc">小程序内直接购买，微信支付安全便捷</text>
+            <text class="gp-method-desc">¥5 一份，微信支付安全便捷</text>
           </view>
           <text class="gp-method-arrow">›</text>
         </view>