feat(provider): add CodeBuddy CN provider (copilot.tencent.com)

Add Tencent CodeBuddy CN (codebuddy-cn) OAuth provider with full support:
OAuth login (GET poll with state query param), token refresh, 15-model
catalog, /v2 inference endpoint, forced streaming, OpenAI-style reasoning,
and per-model capabilities. Renamed from codebuddy to codebuddy-cn to allow
a future codebuddy-ai variant.

Co-authored-by: Cursor <cursoragent@cursor.com>

open-sse/providers/registry/codebuddy-cn.js

@@ -0,0 +1,62 @@
+export default {
+  id: "codebuddy-cn",
+  hidden: false,
+  priority: 90,
+  display: {
+    name: "CodeBuddy CN",
+    icon: "smart_toy",
+    color: "#006EFF",
+    website: "https://copilot.tencent.com",
+    notice: {
+      signupUrl: "https://copilot.tencent.com",
+    },
+  },
+  category: "oauth",
+  transport: {
+    baseUrl: "https://copilot.tencent.com/v2/chat/completions",
+    forceStream: true,
+    // CodeBuddy is a unified OpenAI-compatible gateway: every model (GLM, Kimi,
+    // MiniMax, DeepSeek, Hunyuan) takes reasoning via OpenAI-style reasoning_effort,
+    // not its vendor-native thinking shape. Force the openai thinking format.
+    thinkingFormat: "openai",
+    headers: {
+      "User-Agent": "CLI/2.108.1 CodeBuddy/2.108.1",
+      "X-Product": "SaaS",
+      "X-IDE-Type": "CLI",
+      "X-IDE-Name": "CLI",
+      "x-requested-with": "XMLHttpRequest",
+      "x-codebuddy-request": "1",
+    },
+    auth: {
+      combined: true,
+      header: "Authorization",
+      scheme: "bearer",
+    },
+  },
+  models: [
+    { id: "glm-5.2", name: "GLM-5.2" },
+    { id: "glm-5.1", name: "GLM-5.1" },
+    { id: "glm-5.0", name: "GLM-5.0" },
+    { id: "glm-5.0-turbo", name: "GLM-5.0-Turbo" },
+    { id: "glm-5v-turbo", name: "GLM-5v-Turbo" },
+    { id: "glm-4.7", name: "GLM-4.7" },
+    { id: "minimax-m3", name: "MiniMax-M3" },
+    { id: "minimax-m2.7", name: "MiniMax-M2.7" },
+    { id: "kimi-k2.7", name: "Kimi-K2.7-Code" },
+    { id: "kimi-k2.6", name: "Kimi-K2.6" },
+    { id: "kimi-k2.5", name: "Kimi-K2.5" },
+    { id: "hy3-preview", name: "Hy3 Preview" },
+    { id: "deepseek-v4-pro", name: "DeepSeek-V4-Pro" },
+    { id: "deepseek-v4-flash", name: "DeepSeek-V4-Flash" },
+    { id: "deepseek-v3-2-volc", name: "DeepSeek-V3.2" },
+  ],
+  oauth: {
+    baseUrl: "https://copilot.tencent.com",
+    stateUrl: "https://copilot.tencent.com/v2/plugin/auth/state",
+    tokenUrl: "https://copilot.tencent.com/v2/plugin/auth/token",
+    refreshUrl: "https://copilot.tencent.com/v2/plugin/auth/token/refresh",
+    userAgent: "CLI/2.63.2 CodeBuddy/2.63.2",
+    platform: "CLI",
+    pollInterval: 5000,
+  },
+};