docs: add guide link to README badges and Quick Start

- Badge: "guide — How it Works" (blueviolet) in both EN/KO
- Quick Start section: "How it works — Interactive Guide →" link
- Korean: "작동 원리 가이드 →" link

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: unamedkr

README.ko.md

@@ -17,6 +17,7 @@
   <a href="https://github.com/quantumaikr/quant.cpp/releases/latest"><img src="https://img.shields.io/github/v/release/quantumaikr/quant.cpp?label=release" alt="Release"></a>
   <a href="#"><img src="https://img.shields.io/badge/license-Apache%202.0-blue" alt="License"></a>
   <a href="#"><img src="https://img.shields.io/badge/tests-35%20pass-brightgreen" alt="Tests"></a>
+  <a href="https://quantumaikr.github.io/quant.cpp/guide/"><img src="https://img.shields.io/badge/guide-작동_원리-blueviolet" alt="Guide"></a>
 </p>
 
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@@ -34,7 +35,7 @@ m = Model.from_pretrained("Llama-3.2-1B")  # 모델 자동 다운로드 (~750 MB
 print(m.ask("중력이란 무엇인가요?"))
 ```
 
-API 키 없음. GPU 없음. 설정 없음. [브라우저에서 바로 체험 →](https://quantumaikr.github.io/quant.cpp/)
+API 키 없음. GPU 없음. 설정 없음. [브라우저에서 바로 체험 →](https://quantumaikr.github.io/quant.cpp/) · [**작동 원리 가이드 →**](https://quantumaikr.github.io/quant.cpp/guide/)
 
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README.md

@@ -28,6 +28,7 @@
   <br>
   <a href="#"><img src="https://img.shields.io/badge/models-7%20verified-blue" alt="Models"></a>
   <a href="https://quantumaikr.github.io/quant.cpp/"><img src="https://img.shields.io/badge/WASM_demo-192KB-purple" alt="WASM"></a>
+  <a href="https://quantumaikr.github.io/quant.cpp/guide/"><img src="https://img.shields.io/badge/guide-How_it_Works-blueviolet" alt="Guide"></a>
   <a href="#"><img src="https://img.shields.io/badge/platforms-macOS%20%7C%20Linux%20%7C%20WASM-orange" alt="Platforms"></a>
 </p>
 
@@ -55,7 +56,7 @@ quantcpp
 # AI: Gravity is a fundamental force...
 ```
 
-Downloads Llama-3.2-1B (~750 MB) on first use, cached locally. No API key, no GPU. [Try in browser →](https://quantumaikr.github.io/quant.cpp/)
+Downloads Llama-3.2-1B (~750 MB) on first use, cached locally. No API key, no GPU. [Try in browser →](https://quantumaikr.github.io/quant.cpp/) · [**How it works — Interactive Guide →**](https://quantumaikr.github.io/quant.cpp/guide/)
 
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