Fix/override delete

[lijiayang619]

修复智能体配置页面自定义参数删除失败的问题
max token不生效的问题

[Copilot]

🟡 Changes recommended

The new /temporary_healthcheck “reuse stored api_key” behavior can leak stored API keys to an arbitrary caller-supplied base_url unless additional safeguards are added.

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Pull request overview

This PR addresses two operator-facing issues in Nexent’s model/agent configuration flows: (1) custom parameter deletions in the agent “model params override” dialog not persisting, and (2) “max token”/capacity override values not taking effect at runtime.

Changes:

• Frontend: introduces explicit merge/diff logic for extra_params.__custom__, persisting deletions as null markers instead of silently re-inheriting model-level values.
• Frontend/Backend: adds an optional model_id to the temporary model healthcheck request so edit dialogs can validate connectivity without retyping an API key.
• Backend: applies per-agent capacity override fields (W1/W2 capacity fields) from model_params_override into capacity resolution and runtime ModelConfig.

File summaries

File	Description
frontend/services/modelService.ts	Sends optional model_id in model connectivity verification payloads for edit-mode probes.
frontend/app/[locale]/models/components/model/ModelAdvancedSettings.tsx	Adds utilities to merge/diff custom params and to persist deletions via null markers.
frontend/app/[locale]/models/components/model/ModelAddDialogV2.tsx	Passes modelId during edit-mode verification to enable backend “reuse stored key” probing.
frontend/app/[locale]/agents/components/agent-prompt.tsx	Updates override dialog state handling so deleted custom params do not reappear and are saved as explicit removals.
backend/consts/model.py	Extends ModelRequest with model_id for edit-dialog connectivity probes.
backend/apps/model_managment_app.py	Uses model_id to optionally fall back to the stored API key for /temporary_healthcheck.
backend/agents/create_agent_info.py	Honors per-agent capacity overrides and supports null custom values as explicit removal markers at runtime.

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 2
• Review effort level: Lite

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[codecov]

Codecov Report

❌ Patch coverage is 30.76923% with 27 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/agents/create_agent_info.py	14.81%	20 Missing and 3 partials ⚠️
backend/apps/model_managment_app.py	33.33%	3 Missing and 1 partial ⚠️

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