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LoadFactor should only affect scheduling weight, not load rate reporting.

- Add groupID parameter to ListAccounts and ListWithFilters methods
- Implement account filtering by group ID in repository query
- Add group query parameter parsing in account handler
- Update all ListAccounts/ListWithFilters call sites with groupID parameter
- Add group filter UI component to AccountTableFilters
- Add i18n translations for group filter label in English and Chinese
- Update API contract and test stubs to reflect new signature
- Enable filtering accounts by their assigned groups in admin panel

Key changes:
- Upgrade model mapping: Opus 4.5 → Opus 4.6-thinking with precise matching
- Unified rate limiting: scope-level → model-level with Redis snapshot sync
- Load-balanced scheduling by call count with smart retry mechanism
- Force cache billing support
- Model identity injection in prompts with leak prevention
- Thinking mode auto-handling (max_tokens/budget_tokens fix)
- Frontend: whitelist mode toggle, model mapping validation, status indicators
- Gemini session fallback with Redis Trie O(L) matching
- Ops: enhanced concurrency monitoring, account availability, retry logic
- Migration scripts: 049-051 for model mapping unification

- 新增 ops 主服务（ops_service.go）和端口定义（ops_port.go）
- 实现账号可用性检查服务（ops_account_availability.go）
- 实现数据聚合服务（ops_aggregation_service.go）
- 实现告警评估服务（ops_alert_evaluator_service.go）
- 实现告警管理服务（ops_alerts.go）
- 实现数据清理服务（ops_cleanup_service.go）
- 实现并发控制服务（ops_concurrency.go）
- 实现仪表板服务（ops_dashboard.go）
- 实现错误处理服务（ops_errors.go）
- 实现直方图服务（ops_histograms.go）
- 实现指标采集服务（ops_metrics_collector.go）
- 实现查询模式服务（ops_query_mode.go）
- 实现实时监控服务（ops_realtime.go）
- 实现请求详情服务（ops_request_details.go）
- 实现重试机制服务（ops_retry.go）
- 实现配置管理服务（ops_settings.go）
- 实现趋势分析服务（ops_trends.go）
- 实现窗口统计服务（ops_window_stats.go）
- 添加 ops 相关领域常量
- 注册 service 依赖注入