feat: add SiliconFlow as a supported AI provider (#137)

* feat: add SiliconFlow as a supported AI provider in documentation and configuration

* fix: update SiliconFlow configuration comment to English

README.md

@@ -88,6 +88,7 @@ Diagrams are represented as XML that can be rendered in draw.io. The AI processe
 -   Ollama
 -   OpenRouter
 -   DeepSeek
+-   SiliconFlow
 
 All providers except AWS Bedrock and OpenRouter support custom endpoints.
 
@@ -146,7 +147,7 @@ cp env.example .env.local
 
 Edit `.env.local` and configure your chosen provider:
 
--   Set `AI_PROVIDER` to your chosen provider (bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek)
+-   Set `AI_PROVIDER` to your chosen provider (bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek, siliconflow)
 -   Set `AI_MODEL` to the specific model you want to use
 -   Add the required API keys for your provider
 -   `TEMPERATURE`: Optional temperature setting (e.g., `0` for deterministic output). Leave unset for models that don't support it (e.g., reasoning models).

README_CN.md

@@ -88,6 +88,7 @@ https://github.com/user-attachments/assets/b2eef5f3-b335-4e71-a755-dc2e80931979
 -   Ollama
 -   OpenRouter
 -   DeepSeek
+-   SiliconFlow
 
 除AWS Bedrock和OpenRouter外，所有提供商都支持自定义端点。
 
@@ -146,7 +147,7 @@ cp env.example .env.local
 
 编辑 `.env.local` 并配置您选择的提供商：
 
--   将 `AI_PROVIDER` 设置为您选择的提供商（bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek）
+-   将 `AI_PROVIDER` 设置为您选择的提供商（bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek, siliconflow）
 -   将 `AI_MODEL` 设置为您要使用的特定模型
 -   添加您的提供商所需的API密钥
 -   `TEMPERATURE`：可选的温度设置（例如 `0` 表示确定性输出）。对于不支持此参数的模型（如推理模型），请不要设置。

README_JA.md

@@ -88,6 +88,7 @@ https://github.com/user-attachments/assets/b2eef5f3-b335-4e71-a755-dc2e80931979
 -   Ollama
 -   OpenRouter
 -   DeepSeek
+-   SiliconFlow
 
 AWS BedrockとOpenRouter以外のすべてのプロバイダーはカスタムエンドポイントをサポートしています。
 
@@ -146,7 +147,7 @@ cp env.example .env.local
 
 `.env.local`を編集して選択したプロバイダーを設定：
 
--   `AI_PROVIDER`を選択したプロバイダーに設定（bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek）
+-   `AI_PROVIDER`を選択したプロバイダーに設定（bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek, siliconflow）
 -   `AI_MODEL`を使用する特定のモデルに設定
 -   プロバイダーに必要なAPIキーを追加
 -   `TEMPERATURE`：オプションの温度設定（例：`0`で決定論的な出力）。温度をサポートしないモデル（推論モデルなど）では設定しないでください。

docs/ai-providers.md

@@ -63,6 +63,19 @@ Optional custom endpoint:
 DEEPSEEK_BASE_URL=https://your-custom-endpoint
 ```
 
+### SiliconFlow (OpenAI-compatible)
+
+```bash
+SILICONFLOW_API_KEY=your_api_key
+AI_MODEL=deepseek-ai/DeepSeek-V3  # example; use any SiliconFlow model id
+```
+
+Optional custom endpoint (defaults to the recommended domain):
+
+```bash
+SILICONFLOW_BASE_URL=https://api.siliconflow.com/v1  # or https://api.siliconflow.cn/v1
+```
+
 ### Azure OpenAI
 
 ```bash
@@ -120,7 +133,7 @@ If you only configure **one** provider's API key, the system will automatically
 If you configure **multiple** API keys, you must explicitly set `AI_PROVIDER`:
 
 ```bash
-AI_PROVIDER=google  # or: openai, anthropic, deepseek, azure, bedrock, openrouter, ollama
+AI_PROVIDER=google  # or: openai, anthropic, deepseek, siliconflow, azure, bedrock, openrouter, ollama
 ```
 
 ## Model Capability Requirements

env.example

@@ -1,6 +1,6 @@
 # AI Provider Configuration
 # AI_PROVIDER: Which provider to use
-# Options: bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek
+# Options: bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek, siliconflow
 # Default: bedrock
 AI_PROVIDER=bedrock
 
@@ -42,6 +42,11 @@ AI_MODEL=global.anthropic.claude-sonnet-4-5-20250929-v1:0
 # DEEPSEEK_API_KEY=sk-...
 # DEEPSEEK_BASE_URL=https://api.deepseek.com/v1  # Optional: Custom endpoint
 
+# SiliconFlow Configuration (OpenAI-compatible)
+# Base domain can be .com or .cn, defaults to https://api.siliconflow.com/v1
+# SILICONFLOW_API_KEY=sk-...
+# SILICONFLOW_BASE_URL=https://api.siliconflow.com/v1  # Optional: switch to https://api.siliconflow.cn/v1 if needed
+
 # Langfuse Observability (Optional)
 # Enable LLM tracing and analytics - https://langfuse.com
 # LANGFUSE_PUBLIC_KEY=pk-lf-...

lib/ai-providers.ts

@@ -17,6 +17,7 @@ export type ProviderName =
     | "ollama"
     | "openrouter"
     | "deepseek"
+    | "siliconflow"
 
 interface ModelConfig {
     model: any
@@ -47,6 +48,7 @@ const PROVIDER_ENV_VARS: Record<ProviderName, string | null> = {
     ollama: null, // No credentials needed for local Ollama
     openrouter: "OPENROUTER_API_KEY",
     deepseek: "DEEPSEEK_API_KEY",
+    siliconflow: "SILICONFLOW_API_KEY",
 }
 
 /**
@@ -90,7 +92,7 @@ function validateProviderCredentials(provider: ProviderName): void {
  * Get the AI model based on environment variables
  *
  * Environment variables:
- * - AI_PROVIDER: The provider to use (bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek)
+ * - AI_PROVIDER: The provider to use (bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek, siliconflow)
  * - AI_MODEL: The model ID/name for the selected provider
  *
  * Provider-specific env vars:
@@ -104,6 +106,8 @@ function validateProviderCredentials(provider: ProviderName): void {
  * - OPENROUTER_API_KEY: OpenRouter API key
  * - DEEPSEEK_API_KEY: DeepSeek API key
  * - DEEPSEEK_BASE_URL: DeepSeek endpoint (optional)
+ * - SILICONFLOW_API_KEY: SiliconFlow API key
+ * - SILICONFLOW_BASE_URL: SiliconFlow endpoint (optional, defaults to https://api.siliconflow.com/v1)
  */
 export function getAIModel(): ModelConfig {
     const modelId = process.env.AI_MODEL
@@ -139,6 +143,7 @@ export function getAIModel(): ModelConfig {
                         `- AWS_ACCESS_KEY_ID for Bedrock\n` +
                         `- OPENROUTER_API_KEY for OpenRouter\n` +
                         `- AZURE_API_KEY for Azure\n` +
+                        `- SILICONFLOW_API_KEY for SiliconFlow\n` +
                         `Or set AI_PROVIDER=ollama for local Ollama.`,
                 )
             } else {
@@ -259,9 +264,20 @@ export function getAIModel(): ModelConfig {
             }
             break
 
+        case "siliconflow": {
+            const siliconflowProvider = createOpenAI({
+                apiKey: process.env.SILICONFLOW_API_KEY,
+                baseURL:
+                    process.env.SILICONFLOW_BASE_URL ||
+                    "https://api.siliconflow.com/v1",
+            })
+            model = siliconflowProvider.chat(modelId)
+            break
+        }
+
         default:
             throw new Error(
-                `Unknown AI provider: ${provider}. Supported providers: bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek`,
+                `Unknown AI provider: ${provider}. Supported providers: bedrock, openai, anthropic, google, azure, ollama, openrouter, deepseek, siliconflow`,
             )
     }