highlight 'per-class' in confidence mode descriptions

[leeclemnet]

What does this PR do?

For model blocks supporting "Best" confidence mode, explicitly mention per-class confidence in the description. This is to address field eng feedback that the per-class nature of this mode was not obvious.

I did not add "Per Class" to the parameter name in the dropdown because it was too wide for the available space and was cut off.

Type of Change

• Other: workflow block description edit

Testing

• I have tested this change locally
• I have added/updated tests for this change no test update needed

Test details:

• local staging server build

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in hard-to-understand areas
• My changes generate no new warnings or errors
• I have updated the documentation accordingly (if applicable)

Additional Context

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[github-actions]

🤖 Claude review started at commit b3b53fbcc75ebeb8da3c8b2028b890be68fc648a.

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[github-actions]

Skills: review-workflows-blocks, review-topic-prediction-integrity

Reviewed the change: all 10 hunks are the identical description edit for the "Best" confidence mode ("Use F1-optimal thresholds..." → "Use F1-optimal per-class thresholds...") across the object-detection, instance-seg, semantic-seg, and multi-label-classification blocks (v3/v4 + tensor variants). No logic, defaults, control flow, or contracts change.

The new "per-class" wording is accurate: inference/core/entities/requests/inference.py:236-240 confirms "best" mode relies on per-class thresholds (keypoint detection explicitly rejects confidence="best" because model eval "does not yet produce per-class thresholds"). All prior occurrences of the old wording were updated (0 remain, 10 now use the new text). Behavior-neutral text change — no changelog/version bump required.

Reviewed at HEAD: b3b53fb

[github-actions]

😎 PR passes the vibe-check and trust-me-bro verification.