feat(provider): add iFlytek Spark provider preset

[FenjuFu]

讯飞星火（iFlytek Spark）的官方接口 https://spark-api-open.xf-yun.com/v1 是 OpenAI 兼容的，但目前没有预设条目。用户只能选「OpenAI Compatible」后手动填写 base URL，而 DeepSeek、Moonshot、Zhipu、LongCat、MiniMax、Xiaomi 等国内厂商都已有预设。社区此前提过该需求（#3077）。

iFlytek Spark's official endpoint (https://spark-api-open.xf-yun.com/v1) is OpenAI-compatible but has no preset entry, so users must pick "OpenAI Compatible" and type the base URL by hand — while DeepSeek, Moonshot, Zhipu, LongCat, MiniMax and Xiaomi all ship presets. Previously requested in #3077.

Modifications / 改动点

• astrbot/core/config/default.py — 在 config_template 中新增 iFlytek Spark 预设，放在 LongCat 之后、AIHubMix 之前（与其他国内厂商相邻）。字段与 DeepSeek 预设完全同构，type 为现有的 openai_chat_completion，因此不需要新增 source 文件，也不需要改动 manager.py 或 openai_source.py。
• dashboard/src/utils/providerUtils.js — 为 iflytek_spark 注册图标，复用 lobehub 图标库中的 spark-color.svg（该图标在上游标注即为「Spark (讯飞星火)」，https://xinghuo.xfyun.cn ）。

纯新增，不改动任何既有条目的行为。

• This is NOT a breaking change. / 这不是一个破坏性变更。

Screenshots or Test Results / 运行截图或测试结果

本机没有可运行的 AstrBot 实例（无法提供 UI 截图），因此改动通过对配置与前端逻辑的直接断言来验证：

1. 配置模板（AST 解析 default.py 后断言）

template: {'id': 'iflytek_spark', 'provider': 'iflytek_spark', 'type': 'openai_chat_completion',
           'provider_type': 'chat_completion', 'enable': True, 'key': [],
           'api_base': 'https://spark-api-open.xf-yun.com/v1', 'timeout': 120,
           'proxy': '', 'custom_headers': {}}
key shape == DeepSeek: ['api_base', 'custom_headers', 'enable', 'id', 'key',
                        'provider', 'provider_type', 'proxy', 'timeout', 'type']
templates: 60 | ids unique: True
position: 13 - after LongCat / before AIHubMix
ALL ASSERTIONS PASSED

断言内容：字段集合与 DeepSeek 预设完全一致；id 在 60 个模板中唯一且无重复；type / provider_type / api_base 取值正确。python -m py_compile 通过。

2. 前端图标解析（导入 providerUtils.js 后调用）

iflytek_spark -> https://cdn.jsdelivr.net/npm/@lobehub/icons-static-svg@latest/icons/spark-color.svg
existing icons still resolve: OK      # longcat / deepseek / zhipu / openai 回归检查
unknown key -> ""                     # 未知 key 仍回落到空字符串

3. 图标资源：已确认 spark-color.svg 在 CDN 上可正常获取，且在 lobehub/lobe-icons 中的标注为 title: Spark (讯飞星火)。

未做：未使用真实 API key 跑通端到端对话（无可用配额）。由于该预设仅提供 base URL 默认值、完全复用既有的 openai_chat_completion 实现，运行时路径与手动填写 base URL 的「OpenAI Compatible」配置完全一致。

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Checklist / 检查清单

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。（社区需求见 [Feature]老师老师什么时候上星火的服务提供商 #3077）

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。

• 🤓 I have ensured that no new dependencies are introduced.
  / 我确保没有引入新依赖库。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Add a preset configuration and icon support for the iFlytek Spark provider.

New Features:

• Introduce an iFlytek Spark provider preset using the OpenAI-compatible chat completion endpoint.

Enhancements:

• Register a dedicated icon for the iFlytek Spark provider in the dashboard UI.

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[gemini-code-assist]

Code Review

This pull request adds support for the iFlytek Spark provider by adding its default configuration settings in astrbot/core/config/default.py and mapping its icon URL in dashboard/src/utils/providerUtils.js. There are no review comments, so I have no feedback to provide.

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