Add async dataset query jobs

[michaelluetw-bit]

Summary

• add start_query_dataset_job and check_query_dataset_job for long-running FinMind dataset calls
• add a small SQLite-backed durable job store keyed by handle_id
• preserve original_query in polling responses so async results keep user context
• update stdio smoke and tool tests for the expanded tool surface

Verification

• uv run pytest -q → 35 passed
• uv run python smoke.py → SMOKE OK
• uv build → sdist and wheel built
• uvx twine check dist/* → PASSED
• uv run python chatgpt/build_instructions.py → OK, instructions 7986/8000 chars