fix(providers): add Azure AI Foundry host recognition for prompt caching and native search

pkg/providers/openai_compat/provider.go

@@ -417,7 +417,9 @@ func isNativeSearchHost(apiBase string) bool {
 		return false
 	}
 	host := u.Hostname()
-	return host == "api.openai.com" || strings.HasSuffix(host, ".openai.azure.com")
+	return host == "api.openai.com" ||
+		strings.HasSuffix(host, ".openai.azure.com") ||
+		strings.HasSuffix(host, ".services.ai.azure.com")
 }
 
 // supportsPromptCacheKey reports whether the given API base is known to
@@ -430,5 +432,7 @@ func supportsPromptCacheKey(apiBase string) bool {
 		return false
 	}
 	host := u.Hostname()
-	return host == "api.openai.com" || strings.HasSuffix(host, ".openai.azure.com")
+	return host == "api.openai.com" ||
+		strings.HasSuffix(host, ".openai.azure.com") ||
+		strings.HasSuffix(host, ".services.ai.azure.com")
 }

pkg/providers/openai_compat/provider_test.go

@@ -831,6 +831,8 @@ func TestSupportsPromptCacheKey(t *testing.T) {
 		{"https://api.groq.com/openai/v1", false},
 		{"http://localhost:11434/v1", false},
 		{"https://openrouter.ai/api/v1", false},
+		{"https://myfoundry.eastus.services.ai.azure.com/v1", true},
+		{"https://myfoundry.services.ai.azure.com", true},
 		// Edge cases: proxy URLs with openai.com in path should NOT match
 		{"https://my-proxy.com/api.openai.com/v1", false},
 		{"https://proxy.example.com/openai.azure.com/v1", false},
@@ -900,6 +902,7 @@ func TestIsNativeSearchHost(t *testing.T) {
 		{"https://api.deepseek.com/v1", false},
 		{"https://api.groq.com/openai/v1", false},
 		{"http://localhost:11434/v1", false},
+		{"https://myfoundry.eastus.services.ai.azure.com/v1", true},
 		{"", false},
 	}
 	for _, tt := range tests {