feat(providers): add Minimax Coding (China) provider

- Add minimax-cn provider with China endpoint (api.minimaxi.com)
- Add provider icon and configuration
- Add validation and test support
- Add API configuration in open-sse

Co-authored-by: Blade096 <46746496+Blade096@users.noreply.github.com>
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Co-authored-by: Cursor <cursoragent@cursor.com>

src/shared/constants/config.js

@@ -35,6 +35,7 @@ export const PROVIDER_ENDPOINTS = {
   glm: "https://api.z.ai/api/anthropic/v1/messages",
   kimi: "https://api.kimi.com/coding/v1/messages",
   minimax: "https://api.minimax.io/anthropic/v1/messages",
+  "minimax-cn": "https://api.minimaxi.com/anthropic/v1/messages",
   openai: "https://api.openai.com/v1/chat/completions",
   anthropic: "https://api.anthropic.com/v1/messages",
   gemini: "https://generativelanguage.googleapis.com/v1beta/models",

src/shared/constants/providers.js

@@ -18,6 +18,7 @@ export const APIKEY_PROVIDERS = {
   glm: { id: "glm", alias: "glm", name: "GLM Coding", icon: "code", color: "#2563EB", textIcon: "GL" },
   kimi: { id: "kimi", alias: "kimi", name: "Kimi Coding", icon: "psychology", color: "#1E3A8A", textIcon: "KM" },
   minimax: { id: "minimax", alias: "minimax", name: "Minimax Coding", icon: "memory", color: "#7C3AED", textIcon: "MM" },
+  "minimax-cn": { id: "minimax-cn", alias: "minimax-cn", name: "Minimax Coding (China)", icon: "memory", color: "#DC2626", textIcon: "MC" },
   openai: { id: "openai", alias: "openai", name: "OpenAI", icon: "auto_awesome", color: "#10A37F", textIcon: "OA" },
   anthropic: { id: "anthropic", alias: "anthropic", name: "Anthropic", icon: "smart_toy", color: "#D97757", textIcon: "AN" },
   gemini: { id: "gemini", alias: "gemini", name: "Gemini", icon: "diamond", color: "#4285F4", textIcon: "GE" },