fix: 修复 basedpyright 类型错误和语言设置同步问题

runner.py: 将 user_text 解构从 tuple 第二元素改为第一元素（str），
消除 str | list[dict[str,Any]] 与 Msg.content 的类型不兼容问题。
简化了始终为 true 的 user_blocks 条件分支。

repository.py: 将 result.rowcount 的 type: ignore 替换为基于
pyright: ignore[reportAttributeAccessIssue]，消除 basedpyright 错误。

app.dart: 保存 profile 时同步 _locale 和 session store 中的语言标记。

backend/src/core/agentscope/runtime/runner.py

@@ -324,8 +324,7 @@ class AgentScopeRunner:
         if derived_divination is not None:
             user_text = build_divination_user_prompt(derived=derived_divination)
         else:
-            _, latest_user_text = extract_latest_user_payload(run_input)
-            user_text = latest_user_text
+            user_text, _ = extract_latest_user_payload(run_input)
 
         if derived_divination is not None and context_messages:
             last = context_messages[-1]
@@ -342,17 +341,7 @@ class AgentScopeRunner:
             if last.role == "user":
                 return context_messages
 
-        user_blocks = [{"type": "text", "text": user_text}]
-        if (
-            user_blocks
-            and isinstance(user_blocks[0], dict)
-            and user_blocks[0].get("type") == "text"
-        ):
-            content: Any = user_text
-        else:
-            content = user_blocks
-
-        user_msg = Msg(name="user", role="user", content=content)
+        user_msg = Msg(name="user", role="user", content=user_text)
         return [*context_messages, user_msg]
 
     @staticmethod

backend/src/v1/users/repository.py

@@ -41,7 +41,7 @@ class SQLAlchemyUserRepository:
     async def delete_invite_codes_by_owner_id(self, *, user_id: UUID) -> int:
         stmt = delete(InviteCode).where(InviteCode.owner_id == user_id)
         result = await self.session.execute(stmt)
-        return int(result.rowcount or 0)
+        return result.rowcount  # pyright: ignore[reportAttributeAccessIssue]
 
     async def delete_points_audit_snapshots(
         self,
@@ -61,4 +61,4 @@ class SQLAlchemyUserRepository:
                 PointsAuditLedger.user_id_snapshot == user_id
             )
         result = await self.session.execute(stmt)
-        return int(result.rowcount or 0)
+        return result.rowcount  # pyright: ignore[reportAttributeAccessIssue]