main: 优化消息处理逻辑与 Redis 发布

- 调整消息解析流程，支持 JSON 解码与模型实例化
- 增加 `appendMessage` 方法的保存控制参数
- 修复因保存控制导致的重复发布问题
- 优化 Redis 发布逻辑，支持消息内容推送
- 更新注释与待优化标记，提升代码可读性

app/Http/Controllers/ChatSessionSseController.php

@@ -3,6 +3,7 @@
 namespace App\Http\Controllers;
 
 use App\Http\Resources\MessageResource;
+use App\Models\Message;
 use App\Services\ChatService;
 use Illuminate\Http\Request;
 use Illuminate\Http\Response;
@@ -72,7 +73,8 @@ class ChatSessionSseController extends Controller
                         return;
                     }
 
-                    $msg = $this->service->getMessage($sessionId, $payload);
+                    $msg = json_decode($payload, true, 512, JSON_THROW_ON_ERROR);
+                    $msg = new Message($msg);
                     if ($msg && $msg->seq > $lastSentSeq) {
                         if ($msg->seq > $lastSentSeq + 1) {
                             $this->sendBacklog($sessionId, $lastSentSeq, $limit);

app/Services/ChatService.php

@@ -59,13 +59,13 @@ class ChatService
      * @param bool|null $wasDeduped 是否发生了去重（可选，按引用返回）
      * @return Message 返回成功追加的消息实例。如果存在去重键并已存在重复消息，则返回现有的消息。
      */
-    public function appendMessage(array $dto, ?bool &$wasDeduped = null): Message
+    public function appendMessage(array $dto, ?bool &$wasDeduped = null, bool $save = true): Message
     {
         $messageRef = null;
         $isNew = false;
         $wasDeduped = false;
 
-        DB::transaction(function () use ($dto, &$messageRef, &$isNew, &$wasDeduped) {
+        DB::transaction(function () use ($dto, &$messageRef, &$isNew, &$wasDeduped, $save) {
             /** @var ChatSession $session */
             $session = ChatSession::query()
                 ->whereKey($dto['session_id'])
@@ -104,7 +104,9 @@ class ChatService
             ]);
 
             try {
+                if ($save) {
                     $message->save();
+                }
                 $isNew = true;
             } catch (QueryException $e) {
                 if ($this->isUniqueConstraint($e) && $dedupeKey) {
@@ -131,8 +133,10 @@ class ChatService
 
             $messageRef = $message;
 
-            if ($isNew) {
+            if ($isNew && $save) {
                 DB::afterCommit(fn () => $this->publishMessageAppended($message));
+            } else {
+                $this->publishMessageAppended($message);
             }
         });
 
@@ -290,7 +294,8 @@ class ChatService
 
         $channel = "session:{$message->session_id}:messages";
         try {
-            Redis::publish($channel, $message->message_id);
+            //todo::优化这里。
+            Redis::publish($channel, json_encode($message->toArray(), JSON_UNESCAPED_UNICODE|JSON_INVALID_UTF8_IGNORE));
         } catch (\Throwable $e) {
             logger()->warning('Redis publish failed', [
                 'session_id' => $message->session_id,

app/Services/OutputSink.php

@@ -44,7 +44,7 @@ class OutputSink
                 'delta_index' => $deltaIndex,
             ]),
             'dedupe_key' => $dedupeKey,
-        ]);
+        ],$wasDupe,false);
     }
 
     /**