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

internal/lua/adapters/github.lua

@@ -66,10 +66,18 @@ 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