feat: add Chinese LLM providers support with auto-fill API Base URL

- Add support for DeepSeek, Qwen (Alibaba), Kimi (Moonshot), and GLM (Zhipu)
- Implement auto-fill API Base URL when selecting Chinese LLM providers
- Add smart validation and warnings for missing API endpoints
- Fix session state management in task logging service
- Add comprehensive Chinese setup documentation
- Add database migration for new LLM provider enums

Closes #383

surfsense_web/contracts/enums/llm-providers.ts

@@ -3,6 +3,7 @@ export interface LLMProvider {
 	label: string;
 	example: string;
 	description: string;
+	apiBase?: string; // Default API Base URL for the provider / 提供商的默认 API Base URL
 }
 
 export const LLM_PROVIDERS: LLMProvider[] = [
@@ -90,6 +91,35 @@ export const LLM_PROVIDERS: LLMProvider[] = [
 		example: "gpt-5-mini, claude-sonnet-4-5",
 		description: "Access 500+ AI models through one unified API",
 	},
+	// Chinese LLM Providers / 国产 LLM 提供商
+	{
+		value: "DEEPSEEK",
+		label: "DeepSeek",
+		example: "deepseek-chat, deepseek-coder",
+		description: "Chinese high-performance AI models",
+		apiBase: "https://api.deepseek.com",
+	},
+	{
+		value: "ALIBABA_QWEN",
+		label: "Qwen",
+		example: "qwen-max, qwen-plus, qwen-turbo",
+		description: "Alibaba Cloud Qwen LLM",
+		apiBase: "https://dashscope.aliyuncs.com/compatible-mode/v1",
+	},
+	{
+		value: "MOONSHOT",
+		label: "Kimi",
+		example: "moonshot-v1-8k, moonshot-v1-32k, moonshot-v1-128k",
+		description: "Moonshot AI Kimi models",
+		apiBase: "https://api.moonshot.cn/v1",
+	},
+	{
+		value: "ZHIPU",
+		label: "GLM",
+		example: "glm-4, glm-4-flash, glm-3-turbo",
+		description: "Zhipu AI GLM series models",
+		apiBase: "https://open.bigmodel.cn/api/paas/v4",
+	},
 	{
 		value: "CUSTOM",
 		label: "Custom Provider",