feat: implement WebSocket handlers by delegating to sub-packages
Implemented WebSocket handlers by creating and integrating sub-packages:
**New package: api/datasets**
- HandleDatasetList, HandleDatasetRegister, HandleDatasetInfo, HandleDatasetSearch
- Binary protocol parsing for each operation
**Updated ws/handler.go**
- Added jobsHandler, jupyterHandler, datasetsHandler fields
- Updated NewHandler to accept sub-handlers
- Implemented handleAnnotateRun -> api/jobs
- Implemented handleSetRunNarrative -> api/jobs
- Implemented handleStartJupyter -> api/jupyter
- Implemented handleStopJupyter -> api/jupyter
- Implemented handleListJupyter -> api/jupyter
- Implemented handleDatasetList -> api/datasets
- Implemented handleDatasetRegister -> api/datasets
- Implemented handleDatasetInfo -> api/datasets
- Implemented handleDatasetSearch -> api/datasets
**Updated api/routes.go**
- Create jobs, jupyter, and datasets handlers
- Pass all handlers to ws.NewHandler
Build passes, all tests pass.
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