feat(02-01): implement connector-matching heuristic and DB schema extensions
- Create connector-matching.ts with matchConnector, inferTaskType, getConnectorStrengths
- Add TASK_TYPE_PREFERENCE mapping task types to ordered connector lists
- Add ROLE_DEPARTMENT_HINTS mapping departments to task types
- Add CONNECTOR_STRENGTHS with human-readable capability descriptions
- Add TaskType to shared/types.ts
- Add task_type, retry_count, last_failure_at columns to tasks table
- Add getTaskRetryCount, incrementTaskRetryCount, resetTaskRetryCount, setTaskType to AppDatabase
- All 34 unit tests pass
ZacharyZhang-NY
058cc0dc55