feat(billing): add usage analytics charts and summary totals

Add daily usage trend charts with multi-metric toggles, overview vs user
analysis views, date-range filtering, and usage summary API for interval
and all-time totals.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/app.mjs

@@ -4,7 +4,7 @@ import path from 'node:path';
 import { spawn } from 'node:child_process';
 import { fileURLToPath } from 'node:url';
 import express from 'express';
-import { listUsagePaged, listLedgerPaged } from './pagination.mjs';
+import { listUsagePaged, listLedgerPaged, getUsageStats, getUsageSummary } from './pagination.mjs';
 
 const projectRoot = path.join(path.dirname(fileURLToPath(import.meta.url)), '..');
 
@@ -307,7 +307,29 @@ export function createAdminApp(services) {
     res.json({ user: result.user });
   });
 
+  async function handleUsageStats(req, res) {
+    try {
+      const result = await getUsageStats(pool, req.query);
+      res.json(result);
+    } catch (err) {
+      if (err?.code === 'INVALID_TIME_RANGE') {
+        return res.status(400).json({ message: '无效的时间范围' });
+      }
+      throw err;
+    }
+  }
+
+  adminApi.get('/usage/summary', requireAdmin, async (req, res) => {
+    const result = await getUsageSummary(pool, req.query);
+    res.json(result);
+  });
+
+  adminApi.get('/usage/stats', requireAdmin, handleUsageStats);
+
   adminApi.get('/usage', requireAdmin, async (req, res) => {
+    if (req.query.stats === '1' || req.query.stats === 'true') {
+      return handleUsageStats(req, res);
+    }
     const result = await listUsagePaged(pool, req.query);
     res.json(result);
   });
@@ -399,6 +421,14 @@ export function createAdminApp(services) {
     res.json(result);
   });
 
+  adminApi.get('/memory-v2/runtime', requireAdmin, async (_req, res) => {
+    if (!memoryV2ConfigService?.getRuntimeState) {
+      return res.status(503).json({ message: 'Memory V2 配置服务未启用' });
+    }
+    const result = await memoryV2ConfigService.getRuntimeState();
+    return res.json(result);
+  });
+
   adminApi.get('/mindsearch/config', requireAdmin, async (_req, res) => {
     if (!mindSearchConfigService?.getAdminConfig) return res.status(503).json({ message: 'MindSearch 配置未启用' });
     res.json(await mindSearchConfigService.getAdminConfig());