feat(account): add daily/weekly periodic quota limits for API Key accounts

Extend the existing total quota limit with daily and weekly periodic
dimensions. Each dimension is independently configurable and uses lazy
reset — when the period expires, usage is automatically reset to zero on
the next increment. Any dimension exceeding its limit will pause the
account from scheduling.

Backend:
- Add GetQuotaDailyLimit/Used, GetQuotaWeeklyLimit/Used, HasAnyQuotaLimit
- Rewrite IncrementQuotaUsed with atomic CTE SQL for 3-dimension update
- Rewrite ResetQuotaUsed to clear all dimensions and period timestamps
- Update postUsageBilling to use HasAnyQuotaLimit()
- Preserve daily/weekly used values on account edit

Frontend:
- Refactor QuotaLimitCard from single v-model to 3-dimension props
- Add QuotaBadge component for compact D/W/$ display
- Update AccountCapacityCell with per-dimension badges
- Update Create/Edit modals with daily/weekly quota fields
- Update AccountActionMenu hasQuotaLimit to check all dimensions
- Add i18n strings for daily/weekly/total quota labels

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/i18n/locales/en.ts

@@ -1794,11 +1794,17 @@ export default {
       resetQuota: 'Reset Quota',
       quotaLimit: 'Quota Limit',
       quotaLimitPlaceholder: '0 means unlimited',
-      quotaLimitHint: 'Set max spending limit (USD). Account will be paused when reached. Changing limit won\'t reset usage.',
+      quotaLimitHint: 'Set daily/weekly/total spending limits (USD). Account will be paused when any limit is reached. Changing limits won\'t reset usage.',
       quotaLimitToggle: 'Enable Quota Limit',
       quotaLimitToggleHint: 'When enabled, account will be paused when usage reaches the set limit',
-      quotaLimitAmount: 'Limit Amount',
-      quotaLimitAmountHint: 'Maximum spending limit (USD). Account will be auto-paused when reached. Changing limit won\'t reset usage.',
+      quotaDailyLimit: 'Daily Limit',
+      quotaDailyLimitHint: 'Automatically resets every 24 hours from first usage.',
+      quotaWeeklyLimit: 'Weekly Limit',
+      quotaWeeklyLimitHint: 'Automatically resets every 7 days from first usage.',
+      quotaTotalLimit: 'Total Limit',
+      quotaTotalLimitHint: 'Cumulative spending limit. Does not auto-reset — use "Reset Quota" to clear.',
+      quotaLimitAmount: 'Total Limit',
+      quotaLimitAmountHint: 'Cumulative spending limit. Does not auto-reset.',
       testConnection: 'Test Connection',
       reAuthorize: 'Re-Authorize',
       refreshToken: 'Refresh Token',