fix: migrate create_table's upload path to the presigned upload flow

[rohan-hotdata]

Summary

• runtimedb PR #952 removed the legacy POST /v1/files upload endpoint in favor of the presigned direct-to-storage flow (POST /v1/uploads → PUT → finalize). hotdata-ibis's create_table/upload_file was still calling the now-dead endpoint via the SDK's generated UploadsApi.upload_file, breaking every write against any runtimedb deployment past that commit — confirmed 404 on production (api.hotdata.dev).
• Switches to hotdata.uploads.UploadsApi, the SDK's own hand-written orchestration of the presigned flow (session create, storage PUT, finalize, with retries/multipart already built in), rather than hand-rolling it here. No new dependency, no SDK version bump needed — hotdata.uploads is already present across the whole >=0.7,<0.9 pin range.
• One call-site change: upload["id"] → upload["upload_id"] (FinalizeUploadResponse's field name differs from the old UploadResponse).

Cross-repo check

hotdata-dlt-destination only depends on hotdata-ibis for the read-side dataset().ibis() bridge — its write path goes through hotdata_framework.ManagedDatabaseClient entirely independently, so this has no surface overlap with what that repo actually uses.

Verification

• Full offline suite passes (101 tests), ruff clean. Test fixtures updated to mock the three-stage presigned flow (new shared mock_presigned_upload_flow helper in conftest.py) instead of the single POST /v1/files call.
• Live-verified against production (where /v1/files is confirmed 404): examples 01, 03 (read-only, unaffected), 04, 05, and the vector-search example all pass end to end, including the full create_database → create_table → query → drop_database cycle.

Note

This branch and #40 (vector-search helpers) both touch CHANGELOG.md's [Unreleased] section at the same anchor point — expect a small, easy textual conflict when the second one merges; no code overlap otherwise.

Test plan

• uv run pytest
• uv run ruff check src tests examples
• Live run against production, where the legacy endpoint is confirmed removed

🤖 Generated with Claude Code

[claude]

Clean, focused fix. The presigned-flow migration is correct: UploadError and ApiException both map onto HotdataAPIError (preserving the Ibis error-translation chain), the upload_id field rename matches FinalizeUploadResponse, and the test fixtures meaningfully exercise all three upload stages. LGTM.

[claude]

Migration to the presigned upload flow is correct and cleanly scoped. Verified: no missed upload["id"] call sites, new UploadError path handled alongside ApiException, and the updated tests exercise the real SDK upload_file (only HTTP endpoints mocked) so the kwarg names, model_dump return, and upload_id key are all covered.