feat: unify user analytics and optimize overview aggregation

Merge user accounts and usage reporting into one page with a combined ranking and account table, shared precise time ranges, and simpler range labels.

Parse overview metadata once through a schema-only view migration and disable JIT locally for bucket rebuilds. Preserve automatic backfills.

Add redacted OAuth refresh diagnostics, bucket failure context, and regression coverage. Resolve strict Clippy warnings.

frontend/src/api/__tests__/admin-analytics-cache.spec.ts

@@ -113,4 +113,13 @@ describe('adminApi analytics cache options', () => {
     })
   })
 
+  it('refreshes both leaderboards for the same precise period as user accounts', async () => {
+    const range = { from: '2026-09-10T15:20:42Z', to: '2026-09-10T16:20:42Z', timezone: 'Asia/Shanghai' }
+    await adminApi.getLeaderboardUsers(range, { skipCache: true })
+    await adminApi.getLeaderboardUserGroups(range, { skipCache: true })
+    expect(getMock).toHaveBeenCalledWith('/api/admin/stats/leaderboard/users', { params: range })
+    expect(getMock).toHaveBeenCalledWith('/api/admin/stats/leaderboard/user-groups', { params: range })
+    for (const call of cachedRequestMock.mock.calls as unknown[][]) expect(call[2]).toBe(0)
+  })
+
 })

frontend/src/api/admin.ts

@@ -1288,6 +1288,8 @@ export const adminApi = {
 
   // Stats / Leaderboards
   async getLeaderboardUsers(params?: {
+    from?: string
+    to?: string
     start_date?: string
     end_date?: string
     preset?: string
@@ -1302,7 +1304,7 @@ export const adminApi = {
     include_inactive?: boolean
     exclude_admin?: boolean
     user_group_id?: string
-  }): Promise<LeaderboardResponse> {
+  }, options?: AdminAnalyticsRequestOptions): Promise<LeaderboardResponse> {
     const cacheKey = buildCacheKey('admin:stats:leaderboard:users', params)
     return cachedRequest(
       cacheKey,
@@ -1312,11 +1314,13 @@ export const adminApi = {
         })
         return response.data
       },
-      20 * 1000
+      options?.skipCache ? 0 : 20 * 1000
     )
   },
 
   async getLeaderboardUserGroups(params?: {
+    from?: string
+    to?: string
     start_date?: string
     end_date?: string
     preset?: string
@@ -1330,7 +1334,7 @@ export const adminApi = {
     model?: string
     include_inactive?: boolean
     exclude_admin?: boolean
-  }): Promise<LeaderboardResponse> {
+  }, options?: AdminAnalyticsRequestOptions): Promise<LeaderboardResponse> {
     const cacheKey = buildCacheKey('admin:stats:leaderboard:user-groups', params)
     return cachedRequest(
       cacheKey,
@@ -1341,7 +1345,7 @@ export const adminApi = {
         )
         return response.data
       },
-      20 * 1000
+      options?.skipCache ? 0 : 20 * 1000
     )
   },
 
@@ -1621,6 +1625,8 @@ export const adminApi = {
 
   async getTimeSeries(
     params?: {
+      from?: string
+      to?: string
       start_date?: string
       end_date?: string
       preset?: string