Add user space quota purchase flow

server.mjs

@@ -930,6 +930,39 @@ app.get('/auth/billing/recharge-orders/:orderId', async (req, res) => {
   return res.json({ order, balanceCents });
 });
 
+app.post('/auth/billing/space-purchase', jsonBody, async (req, res) => {
+  await userAuthReady;
+  if (!userAuth || !mindSpace) {
+    return res.status(503).json({ message: '空间服务未启用' });
+  }
+  const me = await userAuth.getMe(userToken(req));
+  if (!me) return res.status(401).json({ message: '未登录' });
+  const sizeMb = Math.floor(Number(req.body?.sizeMb));
+  const result = await userAuth.purchaseSpaceQuota(me.id, sizeMb);
+  if (!result?.ok) {
+    if (result?.code === 'INSUFFICIENT_BALANCE') {
+      return res.status(402).json({
+        message: result.message,
+        code: result.code,
+        details: {
+          code: 'INSUFFICIENT_BALANCE',
+          balanceCents: result.balanceCents,
+          minRechargeCents: result.minRechargeCents,
+          suggestedTiers: result.suggestedTiers,
+        },
+      });
+    }
+    return res.status(400).json({ message: result?.message ?? '购买空间失败' });
+  }
+  const quota = await mindSpace.getQuota(me.id);
+  return res.json({
+    quota: quota ?? result.quota,
+    balanceCents: result.balanceCents,
+    purchasedMb: sizeMb,
+    costCents: sizeMb * 200,
+  });
+});
+
 const wechatNotifyBody = express.raw({
   type: ['application/json', 'text/xml', 'application/xml'],
   limit: '64kb',