feat: gravity transaction logging + user-facing history popup

- New GravityTransaction schema tracks all gravity changes (registration,
  interview/optimize/download deduction, purchase, monthly topup, migration)
- GravityTopUpService: bulk log for monthly VIP topup
- PaymentController.activateMembership: log plan_set transactions
- QuotaService: add logTransaction, wire into all gravity-modifying methods
- UserService: log registration grants (phone/wx/email/password)
- GET /user/gravity-transactions?page=&limit= API
- Frontend: user.vue '明细' button + paginated popup
- Docs: update PROJECT-STATUS v4.10, FEATURE-LIST, DEPLOYMENT

backend/src/modules/user/user.controller.ts

@@ -1,4 +1,4 @@
-import { Controller, Post, Get, Put, Body, Req, HttpCode, HttpStatus, UseGuards } from '@nestjs/common'
+import { Controller, Post, Get, Put, Query, Body, Req, HttpCode, HttpStatus, UseGuards } from '@nestjs/common'
 import { UserService } from './user.service'
 import { Public } from '../../common/decorators/public.decorator'
 import { CurrentUser } from '../../common/decorators/current-user.decorator'
@@ -88,4 +88,13 @@ export class UserController {
   async setPassword(@CurrentUser('userId') userId: string, @Body('password') password: string) {
     return this.userService.setPassword(userId, password)
   }
+
+  @Get('gravity-transactions')
+  async getGravityTransactions(
+    @CurrentUser('userId') userId: string,
+    @Query('page') page = '1',
+    @Query('limit') limit = '20',
+  ) {
+    return this.userService.getGravityTransactions(userId, parseInt(page), parseInt(limit))
+  }
 }