fix(ai-review model validation): 驗證 model 並支援自動選模

src/test/config.test.js

@@ -62,6 +62,16 @@ describe('getLLMConfig', () => {
     assert.equal(cfg.model, 'gpt-5.4-mini');
   });
 
+  it('rejects invalid model names', () => {
+    process.env.CLI_PROXY_API = 'https://proxy.example';
+    process.env.MODEL = 'gpt-5.5; rm -rf /';
+
+    const cfg = getLLMConfig();
+
+    assert.equal(cfg.model, null);
+    assert.match(cfg.modelError, /無效的 model 參數/);
+  });
+
   it('returns null provider when CLI_PROXY_API is missing', () => {
     process.env.MODEL = 'gpt-5.5';
     const cfg = getLLMConfig();

src/test/llm.test.js

@@ -88,6 +88,13 @@ describe('chat - CLIProxyAPI', async () => {
     await assert.rejects(() => chat('sys', 'user'), /401/);
     await assert.rejects(() => chat('sys', 'user'), /access token revoked/);
   });
+
+  it('throws when the configured model name is invalid', async () => {
+    process.env.CLI_PROXY_API = 'https://proxy.example';
+    process.env.MODEL = 'gpt-5.5; rm -rf /';
+
+    await assert.rejects(() => chat('sys', 'user'), /無效的 model 參數/);
+  });
 });
 
 describe('chatJSON', async () => {

src/test/preflight.test.js

@@ -208,6 +208,20 @@ describe('verifyLLM', () => {
     assert.match(result.error, /不在 CLIProxyAPI 可用清單/);
     assert.match(result.error, /gpt-9-imaginary/);
   });
+
+  it('fails when the configured model name is invalid', async () => {
+    clearLLMEnv();
+    process.env.CLI_PROXY_API = 'https://proxy.example';
+    process.env.MODEL = 'gpt-5.5; rm -rf /';
+
+    const result = await verifyLLM({
+      fetchLLMModelsFn: async () => ({ ok: true, slugs: ['gpt-5.5'] }),
+    });
+
+    assert.equal(result.ok, false);
+    assert.equal(result.provider, 'cliproxyapi');
+    assert.match(result.error, /無效的 model 參數/);
+  });
 });
 
 describe('runPreflight', () => {