server : fix dry_sequence_breakers missing from GET /props generation settings

[verma8076]

Problem

The only_metrics branch of task_params::to_json() - used by GET /props to populate default_generation_settings.params - was missing the dry_sequence_breakers field.

The full completion-response branch already reported it correctly. All other DRY parameters (dry_multiplier, dry_base, dry_allowed_length, dry_penalty_last_n) were present in both branches, so this is an oversight from when the field was originally added to the second branch without being added to the first.

This means GET /props gives an incomplete view of the active DRY sampler configuration, making it inconsistent with the completion response's generation_settings.

Discovered while reviewing the same area of code as #25803.

Changes

• tools/server/server-task.cpp: add dry_sequence_breakers to the only_metrics block, matching its position after dry_penalty_last_n in the full block.
• tools/server/tests/unit/test_basic.py: add an assertion to test_server_props() that dry_sequence_breakers is present in default_generation_settings.params.

Verification

curl -s localhost:8080/props | jq '.default_generation_settings.params | has("dry_sequence_breakers")'
# Before: false
# After:  true

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