Eternity d477e24e34 refactor(workflow): add new engine and utils modules ...

- Add engine/ directory with core components:
  - graph_builder: workflow graph construction
  - variable_pool: variable management
  - state_manager: execution state tracking
  - event_stream_handler: event processing
  - stream_output_coordinator: streaming output control
  - result_builder: result aggregation
  - runtime_schema: runtime type definitions

- Add utils/ directory with utilities:
  - expression_evaluator: safe expression evaluation
  - template_renderer: Jinja2 template rendering

2026-02-10 13:54:52 +08:00

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