fix: disable playground request parameters by default

[feitianbubu]

⚠️ 提交说明 / PR Notice

Playground 的参数面板目前默认启用 temperature、top_p、frequency_penalty、presence_penalty 四个参数。但现在很多新模型不支持这些参数，收到会直接返回 400，新用户选中这类模型发第一条消息就报错，参数面板又比较隐蔽

这个 PR 把 DEFAULT_PARAMETER_ENABLED 全部改为默认关闭, 想调参的用户可以手动开

老用户不受影响：开关状态已持久化在 localStorage，初始化时会覆盖默认值。

🚀 变更类型 / Type of change

• 🐛 Bug 修复 (Bug fix) - 请关联对应 Issue，避免将设计取舍、理解偏差或预期不一致直接归类为 bug
• ✨ 新功能 (New feature) - 重大特性建议先通过 Issue 沟通
• ⚡ 性能优化 / 重构 (Refactor)
• 📝 文档更新 (Documentation)

🔗 关联任务 / Related Issue

• 无

✅ 提交前检查项 / Checklist

• 人工确认: 我已亲自整理并撰写此描述，没有直接粘贴未经处理的 AI 输出。
• 非重复提交: 我已搜索现有的 Issues 与 PRs，确认不是重复提交。
• Bug fix 说明: 若此 PR 标记为 Bug fix，我已提交或关联对应 Issue，且不会将设计取舍、预期不一致或理解偏差直接归类为 bug。
• 变更理解: 我已理解这些更改的工作原理及可能影响。
• 范围聚焦: 本 PR 未包含任何与当前任务无关的代码改动。
• 本地验证: 已在本地运行并通过测试或手动验证，维护者可以据此复核结果。
• 安全合规: 代码中无敏感凭据，且符合项目代码规范。

Summary by CodeRabbit

• Improvements
  • Simplified the playground’s default settings by disabling advanced generation parameters initially.
  • Parameters such as temperature, top-p, frequency penalty, and presence penalty can still be enabled when needed.

[coderabbitai]

Walkthrough

The playground now disables temperature, top_p, frequency_penalty, and presence_penalty by default. max_tokens remains disabled.

Changes

Playground parameter defaults

Layer / File(s)	Summary
Update default parameter flags web/src/features/playground/constants.ts	DEFAULT_PARAMETER_ENABLED now disables four configurable parameters by default while retaining the existing max_tokens setting.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• QuantumNous/new-api#6044: Introduces the playground settings behavior affected by these default parameter changes.

Suggested reviewers: calcium-ion

Poem

I’m a bunny tuning flags with care,
Four parameters now start bare.
max_tokens stays asleep,
Defaults settle in a heap—
Hop, review, and breathe fresh air!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: disabling playground request parameters by default.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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