docs: refine readme hero positioning

Author: iancaoo

README.md

@@ -1,9 +1,12 @@
 <h1 align="center">DataFoundry</h1>
 
-<p align="center"><strong>An AI data analyst your enterprise can actually trust</strong></p>
+<p align="center">
+  An open-source, enterprise-grade Data Agent workbench — it reads business definitions through unified semantics, runs complex multi-table, multi-step analysis inside read-only boundaries,<br />
+  and keeps every step auditable and replayable, turning one question into a trustworthy analysis.
+</p>
 
 <p align="center">
-  An open-source, enterprise-grade Data Agent workbench that turns one question into a trustworthy analysis — semantics understood, boundaries enforced, evidence preserved.
+  <strong>28 datasource types out of the box · Enterprise semantics & context · Self-hosted · Multi-model · Fully auditable</strong>
 </p>
 
 <p align="center">

README_zh.md

@@ -1,9 +1,12 @@
 <h1 align="center">DataFoundry</h1>
 
-<p align="center"><strong>给企业一个值得信任的 AI 数据分析师</strong></p>
+<p align="center">
+  开源的企业级 Data Agent 工作台 —— 用统一语义读懂业务口径，在只读安全边界内执行多表、多步的复杂分析，<br />
+  每一步可审计、可回放，把一句提问变成一次可信的数据分析。
+</p>
 
 <p align="center">
-  开源的企业级 Data Agent 工作台 —— 懂口径、守边界、留证据，把一句提问变成一次可信的数据分析。
+  <strong>28 类数据源开箱接入 · 企业语义与上下文组织 · 私有化部署 · 多模型适配 · 全程审计可追溯</strong>
 </p>
 
 <p align="center">