minor: update readme (#361)

Author: zhourrr

README.md

@@ -50,7 +50,7 @@
 ## 💫 Features
 
 - **Blazing Fast**: Searches billions of vectors in milliseconds.
-- **Simple, Just Works**: [Install](#-installation) and start searching in seconds. No servers, no config, no fuss.
+- **Simple, Just Works**: [Install](#-installation) and start searching in seconds. Pure local, no servers, no config, no fuss.
 - **Dense + Sparse Vectors**: Work with both dense and sparse embeddings, with native support for multi-vector queries in a single call.
 - **Hybrid Search**: Combine semantic similarity with structured filters for precise results.
 - **Durable Storage**: Write-ahead logging (WAL) guarantees persistence — data is never lost, even on process crash or power failure.

README_CN.md

@@ -50,7 +50,7 @@
 ## 💫 核心特性
 
 - **极致性能**：毫秒级响应，轻松检索数十亿级向量。
-- **开箱即用**：[安装](#-安装)后即刻开始搜索，无需服务器、无需配置、零门槛。
+- **开箱即用**：[安装](#-安装)后即刻开始搜索，纯本地运行，无需服务器、无需配置、零门槛。
 - **稠密 + 稀疏向量**：支持稠密向量和稀疏向量，提供多向量联合查询的原生支持。
 - **混合检索**：向量语义搜索 + 标量条件过滤，获得精确结果。
 - **持久化存储**：WAL 预写日志保障数据持久性 — 即使进程崩溃或意外断电，数据也不会丢失。