feat: add Alibaba Cloud Coding Plan support

Add support for Alibaba Cloud Bailian Coding Plan, a coding-focused AI service
that provides fixed monthly pricing for multiple models.

Changes:
- Add alicloud provider with OpenAI-compatible API endpoint
- Support 8 models: qwen3.5-plus, kimi-k2.5, glm-5, MiniMax-M2.5,
  qwen3-max, qwen3-coder-next, qwen3-coder-plus, glm-4.7
- Use "ali" as provider alias (ali/model format)
- Add API key validation and connection testing
- Add frontend provider definition with "ALi" text icon

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/shared/constants/config.js

@@ -37,6 +37,7 @@ export const PROVIDER_ENDPOINTS = {
   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",
+  alicloud: "https://coding.dashscope.aliyuncs.com/v1/chat/completions",
   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

@@ -24,6 +24,7 @@ export const APIKEY_PROVIDERS = {
   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 (China)", icon: "memory", color: "#DC2626", textIcon: "MC" },
+  alicloud: { id: "alicloud", alias: "alicloud", name: "阿里云百炼 Coding Plan", icon: "cloud", color: "#FF6A00", textIcon: "ALi" },
   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" },