wboayue / rust-ibapi / 26011892968

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errors: EOF / no-response sites → Error::UnexpectedEndOfStream (#585)

PR-2 of plans/error-variants-audit.md. Flip 8 no-response sites from
Error::Simple to Error::UnexpectedEndOfStream so callers can pattern-match
on the typed variant:

- accounts/{sync,async}/mod.rs server_time + server_time_millis (4)
- orders/{sync,async}/mod.rs next_valid_id no-response (2)
- orders/builder/{sync,async}_impl.rs what-if analyze() empty stream (2)

Downstream tests and parallel mocks updated accordingly. Renames the
test-table sentinel string "No response from server" → "unexpected
end of stream" so the table entry reflects the actual error variant.

Verified default + sync + all-features clippy and tests.

4 of 9 new or added lines in 7 files covered. (44.44%)

18982 of 20606 relevant lines covered (92.12%)

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