Update z.ai skill with correct BigModel API URL

- Update base_url to https://open.bigmodel.cn/api/paas/v4
- Mark API key as configured

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

skills/ai-providers/z-ai.md

@@ -11,14 +11,14 @@ Fallback AI provider with GLM (General Language Model) support. Use when synthet
 
 ## Configuration
 ```yaml
-provider: z.ai
-base_url: https://api.z.ai/v1
+provider: z.ai (Zhipu AI / BigModel)
+base_url: https://open.bigmodel.cn/api/paas/v4
 api_key_env: Z_AI_API_KEY
 compatibility: openai
 rate_limit: 60 requests/minute
 ```
 
-**Note:** API key needs to be configured. Check z.ai dashboard for key generation.
+**API Key configured:** `Z_AI_API_KEY` in environment variables.
 
 ## Available Models
 
@@ -152,7 +152,7 @@ function shouldPreferGLM(task) {
 ```json
 {
   "method": "POST",
-  "url": "https://api.z.ai/v1/chat/completions",
+  "url": "https://open.bigmodel.cn/api/paas/v4/chat/completions",
   "headers": {
     "Authorization": "Bearer {{ $env.Z_AI_API_KEY }}",
     "Content-Type": "application/json"
@@ -182,7 +182,7 @@ async function callZAI(systemPrompt, userPrompt, options = {}) {
 
   const response = await $http.request({
     method: 'POST',
-    url: 'https://api.z.ai/v1/chat/completions',
+    url: 'https://open.bigmodel.cn/api/paas/v4/chat/completions',
     headers: {
       'Authorization': `Bearer ${$env.Z_AI_API_KEY}`,
       'Content-Type': 'application/json'
@@ -231,7 +231,7 @@ Z_AI_API_KEY=your_key_here
 
 ### 3. Test Connection
 ```bash
-curl -X POST https://api.z.ai/v1/chat/completions \
+curl -X POST https://open.bigmodel.cn/api/paas/v4/chat/completions \
   -H "Authorization: Bearer $Z_AI_API_KEY" \
   -H "Content-Type: application/json" \
   -d '{