feat: add Zhipu AI (GLM) model provider support

Adds zhipuai as a new provider using the OpenAI-compatible API at
api.z.ai. Supports api_key config or ZHIPUAI_API_KEY env var, with
optional endpoint override.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/daemon/clientFactory.test.ts

@@ -87,6 +87,15 @@ describe('createClientFromConfig', () => {
     expect(client).toBeInstanceOf(OpenAIClient);
   });
 
+  it('creates OpenAIClient with Zhipu AI baseURL for zhipuai provider', () => {
+    const client = createClientFromConfig({
+      provider: 'zhipuai',
+      model: 'glm-4.5',
+      api_key: 'test-key',
+    });
+    expect(client).toBeInstanceOf(OpenAIClient);
+  });
+
   it('creates BedrockClient for bedrock provider', () => {
     const client = createClientFromConfig({
       provider: 'bedrock',