Refactor brand service and related components

- Removed ListQuestionVersions method and associated types from BrandService and Queries.
- Updated PromptRuleGenerationService to change task naming and handling.
- Enhanced ScheduleTaskService to support filtering by created date range and keyword.
- Introduced InstantTaskService for managing instant tasks with appropriate filtering and response structures.
- Added InstantTaskHandler for handling API requests related to instant tasks.
- Created InstantTaskTab component for the admin web interface to display and manage instant tasks.
- Updated database migrations to rename source types for articles and generation tasks.
- Adjusted models and repository queries to reflect the removal of question version handling.

docs/geo-platform-ops-admin-tech-architecture-v1.md

@@ -1070,7 +1070,6 @@ flowchart LR
 - `/api/tenant/brands/{id}`
 - `/api/tenant/brands/{id}/keywords`
 - `/api/tenant/brands/{id}/questions`
-- `/api/tenant/brands/{id}/question-versions`
 - `/api/tenant/brands/{id}/competitors`
 - `/api/tenant/knowledge/groups`
 - `/api/tenant/knowledge/items`

docs/superpowers/specs/2026-03-31-admin-web-backend-core-design.md

@@ -557,7 +557,6 @@ workspace_service 聚合多个 repository 数据，单次返回，避免前端
 | DELETE | `/api/tenant/brands/{id}/keywords/{kid}` | 删除关键词 |
 | GET | `/api/tenant/brands/{id}/questions` | 问题列表 (按关键词筛选) |
 | POST | `/api/tenant/brands/{id}/questions` | 创建问题 (自动创建 v1 版本) |
-| GET | `/api/tenant/brands/{id}/question-versions` | 问题版本列表 |
 | GET | `/api/tenant/brands/{id}/competitors` | 竞品列表 |
 | POST | `/api/tenant/brands/{id}/competitors` | 创建竞品 |
 | PUT | `/api/tenant/brands/{id}/competitors/{cid}` | 更新竞品 |