refactor: rename provider to alicode (Aliyun Coding)

Rename alicloud to alicode to clearly indicate Aliyun's Coding Plan service.

- Provider ID: alicode (short for Aliyun Coding)
- Model format: alicode/qwen3.5-plus
- Simplified mapping - no more bidirectional aliases

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

src/app/api/providers/[id]/models/route.js

@@ -72,7 +72,7 @@ const PROVIDER_MODELS_CONFIG = {
     authHeader: "x-api-key",
     parseResponse: (data) => data.data || []
   },
-  alicloud: {
+  alicode: {
     url: "https://coding.dashscope.aliyuncs.com/v1/models",
     method: "GET",
     headers: { "Content-Type": "application/json" },

src/app/api/providers/[id]/test/route.js

@@ -464,7 +464,7 @@ async function testApiKeyConnection(connection) {
         return { valid, error: valid ? null : "Invalid API key" };
       }
 
-      case "alicloud": {
+      case "alicode": {
         // 阿里云百炼 Coding Plan uses OpenAI-compatible API
         const res = await fetch("https://coding.dashscope.aliyuncs.com/v1/chat/completions", {
           method: "POST",

src/app/api/providers/validate/route.js

@@ -103,19 +103,19 @@ export async function POST(request) {
         case "kimi":
         case "minimax":
         case "minimax-cn":
-        case "alicloud": {
+        case "alicode": {
           const claudeBaseUrls = {
             glm: "https://api.z.ai/api/anthropic/v1/messages",
             "glm-cn": "https://open.bigmodel.cn/api/coding/paas/v4/chat/completions",
             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",
+            alicode: "https://coding.dashscope.aliyuncs.com/v1/chat/completions",
           };
 
-          // glm-cn and alicloud use OpenAI format
-          if (provider === "glm-cn" || provider === "alicloud") {
-            const testModel = provider === "alicloud" ? "qwen3.5-plus" : "glm-4.7";
+          // glm-cn and alicode use OpenAI format
+          if (provider === "glm-cn" || provider === "alicode") {
+            const testModel = provider === "alicode" ? "qwen3.5-plus" : "glm-4.7";
             const glmCnRes = await fetch(claudeBaseUrls[provider], {
               method: "POST",
               headers: {