fix: tool call anchor & wire format, streaming chunk passthrough, WebUI narrow-screen, docs bilingual

internal/lua/adapters/deepseek.lua

@@ -20,6 +20,18 @@ function adapter.transform_request(raw_body)
         req.extra_body.thinking = { type = "disabled" }
     end
     req.disable_thinking = nil
+
+    -- V4 thinking 模式要求：带 tool_calls 的 assistant 消息必须回传 reasoning_content。
+    -- OpenAI 兼容客户端不会发该字段，补空串即可通过校验。
+    if req.messages then
+        for _, msg in ipairs(req.messages) do
+            if msg.role == "assistant" and msg.tool_calls and msg.tool_calls[1] then
+                if msg.reasoning_content == nil then
+                    msg.reasoning_content = ""
+                end
+            end
+        end
+    end
     return json.encode(req)
 end
 
@@ -73,10 +85,18 @@ function adapter.transform_stream_chunk(raw_chunk)
     if not chunk.choices or #chunk.choices == 0 then return "" end
     local delta = chunk.choices[1].delta or {}
     local fr = chunk.choices[1].finish_reason
-    return json.encode({
+
+    local unified = {
         content = delta.content or "",
         done = (fr ~= nil)
-    })
+    }
+    if delta.reasoning_content then
+        unified.reasoning_content = delta.reasoning_content
+    end
+    if delta.tool_calls then
+        unified.tool_calls = delta.tool_calls
+    end
+    return json.encode(unified)
 end
 
 return adapter