Jack c6eee09ed3 feat: migrate POST /api/v1/datasets/<dataset_id>/documents/stop to Go (#15597) ...

## Summary

Migrate the stop parse documents endpoint from Python to Go.

### Python endpoint
`POST /api/v1/datasets/<dataset_id>/documents/stop` —
`api/apps/restful_apis/document_api.py:1542-1641`

### Changes
| File | Change |
|------|--------|
| `internal/dao/task.go` | Add `GetByDocID` method |
| `internal/dao/task_test.go` | 3 DAO tests (new file) |
| `internal/service/document.go` | Add `StopParseDocuments` + refactor
shared helpers |
| `internal/service/document_test.go` | 8 service tests |
| `internal/handler/document.go` | Add handler + request struct +
interface |
| `internal/handler/document_test.go` | 5 handler tests |
| `internal/router/router.go` | Add `POST /:dataset_id/documents/stop`
route |

### How it works
1. Validates all document IDs belong to the dataset
2. For each document in RUNNING/CANCEL state (or with unfinished tasks):
- Sets Redis cancel signal `{task_id}-cancel` for each associated task
   - Updates `document.run` to CANCEL ("2")
3. Returns `{"success_count": N, "errors": [...]}`

### Test strategy
- **DAO/Service**: SQLite in-memory DB, zero mocks. Redis is nil-safe by
design.
- **Handler**: `fakeDocumentService` implementing `documentServiceIface`
interface.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

2026-06-04 14:16:13 +08:00

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