feat: add built-in Volcengine Ark provider support (#741)

Add Volcengine Ark as a first-class API key provider with official model presets, endpoint configuration, API key validation, model discovery, connection testing, provider logo, and runtime alias mapping for `ark/*` model IDs.

Made-with: Cursor

Co-authored-by: kingsy <kingsylin@vip.qq.com>

src/shared/constants/config.js

@@ -56,6 +56,7 @@ export const PROVIDER_ENDPOINTS = {
   "minimax-cn": "https://api.minimaxi.com/anthropic/v1/messages",
   alicode: "https://coding.dashscope.aliyuncs.com/v1/chat/completions",
   "alicode-intl": "https://coding-intl.dashscope.aliyuncs.com/v1/chat/completions",
+  "volcengine-ark": "https://ark.cn-beijing.volces.com/api/coding/v3/chat/completions",
   openai: "https://api.openai.com/v1/chat/completions",
   anthropic: "https://api.anthropic.com/v1/messages",
   gemini: "https://generativelanguage.googleapis.com/v1beta/models",