feat(admin): add balance management page#487

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s-Joshua-s wants to merge 8 commits intoWei-Shaw:mainfrom

s-Joshua-s:feat/admin-balance-management

Commits on Feb 5, 2026

task(T2.1,T2.2): implement balance group user stats repo and service

JIA-ss
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claude
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task(T2.3): add balance handler, DI wiring, and admin routes

JIA-ss
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claude
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task(T2.4): add frontend balance API module

JIA-ss
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claude
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task(T3.1-T3.4): add BalanceView admin page

JIA-ss
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claude
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task(T4.1,T4.2): add i18n translations, sidebar nav, and route

JIA-ss
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claude
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fix(balance): address code review findings

JIA-ss
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claude
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task(T1.1,T1.2): add balance group user stats types and database index

JIA-ss
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claude
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fix: resolve CI failures for balance management feature

JIA-ss
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claude
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