fix: mock purchase now actually activates subscription

POST /api/v1/subscription/purchase only creates an order without
activating. Add POST /api/v1/subscription/mock-purchase that does
purchase + verify in one step (non-production only). Miniprogram
subscribe page now calls mock-purchase so subscriptions take effect.

server/src/routes/subscription.js

@@ -46,6 +46,19 @@ router.post('/subscription/purchase', requireUser, wrap(async (req, res) => {
   res.json(ok({ order_id: orderId, payment_params: {}, plan, amount: PLANS[plan].amount }))
 }))
 
+router.post('/subscription/mock-purchase', requireUser, wrap(async (req, res) => {
+  const config = require('../config')
+  if (config.nodeEnv === 'production') return res.json(fail(2001, 'not available in production'))
+  const plan = req.body.plan || req.body.plan_type
+  if (!PLANS[plan] || plan === 'trial') return res.json(fail(2001, 'invalid plan'))
+  const p = PLANS[plan]
+  const orderId = 'MOCK' + Date.now()
+  await subscriptionDao.purchase(req.user.user_id, plan, p.amount, orderId, p.days)
+  const logDao = require('../dao/log.dao')
+  await logDao.write({ user_id: req.user.user_id, action: 'subscription_mock_purchase', detail: '模拟购买: ' + plan, ip: req.ip })
+  res.json(ok({ status: 'active', plan, remaining_days: p.days }))
+}))
+
 router.post('/subscription/trial', requireUser, wrap(async (req, res) => {
   const usedTrial = await subscriptionDao.findTrial(req.user.user_id)
   if (usedTrial) return res.json(fail(2001, '已使用过试用'))