Test zero-size remote file reads

[fallintoplace]

Summary

• add Python RemoteFile.read(size=0) regression coverage for HTTP reads
• run the zero-size reads against a no-range HTTP server so the test fails if KvikIO tries to set a range request
• cover offsets at start-of-file and EOF while verifying the destination buffer is untouched

Notes

Current main already returns 0 in RemoteHandle::read() before setting up a range request when size is 0. This adds Python API coverage for that behavior.

Validation

• pre-commit run --files python/kvikio/tests/test_http_io.py
• git diff --check

Not run locally: python3 -m pytest python/kvikio/tests/test_http_io.py -k zero_size_read_returns_without_range_request -q because the system Python does not have pytest installed.

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