docs(deepseek): update config guides for independent DeepSeek module

Update DeepSeek docs (zh/en/ja) and README to reflect the new dedicated deepseek_api_key / deepseek_api_base config fields, with backward compatibility notes.

Made-with: Cursor

README.md

@@ -155,6 +155,8 @@ pip3 install -r requirements-optional.txt
   "claude_api_base": "https://api.anthropic.com/v1",          # Claude API 地址，修改可接入三方代理平台
   "gemini_api_key": "",                                       # Gemini API Key
   "gemini_api_base": "https://generativelanguage.googleapis.com", # Gemini API地址
+  "deepseek_api_key": "",                                      # DeepSeek API Key
+  "deepseek_api_base": "https://api.deepseek.com/v1",         # DeepSeek API 地址，可修改为第三方代理
   "open_ai_api_key": "",                                      # OpenAI API Key
   "open_ai_api_base": "https://api.openai.com/v1",            # OpenAI API 地址
   "linkai_api_key": "",                                       # LinkAI API Key
@@ -472,20 +474,31 @@ API Key创建：在 [控制台](https://aistudio.google.com/app/apikey?hl=zh-cn)
 
 2. 填写配置
 
+方式一：官方接入（推荐）：
+
 ```json
 {
     "model": "deepseek-chat",
-    "open_ai_api_key": "sk-xxxxxxxxxxx",
-    "open_ai_api_base": "https://api.deepseek.com/v1",
-    "bot_type": "openai"
-
+    "deepseek_api_key": "sk-xxxxxxxxxxx"
 }
 ```
 
- - `bot_type`: OpenAI兼容方式
  - `model`: 可填 `deepseek-chat、deepseek-reasoner`，分别对应的是 DeepSeek-V3 和 DeepSeek-R1 模型
- - `open_ai_api_key`: DeepSeek平台的 API Key
- - `open_ai_api_base`: DeepSeek平台 BASE URL
+ - `deepseek_api_key`: DeepSeek平台的 API Key
+ - `deepseek_api_base`: 可选，默认为 `https://api.deepseek.com/v1`，可修改为第三方代理地址
+
+方式二：OpenAI兼容方式接入：
+
+```json
+{
+    "model": "deepseek-chat",
+    "bot_type": "openai",
+    "open_ai_api_key": "sk-xxxxxxxxxxx",
+    "open_ai_api_base": "https://api.deepseek.com/v1"
+}
+```
+
+> 注：已有用户如果之前通过 `open_ai_api_key` / `open_ai_api_base` 配置 DeepSeek，无需修改，程序会自动兼容。推荐新用户使用方式一的独立配置，避免与 OpenAI 配置冲突。
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