📦 Initialize Geulbeot structure and merge Prompts & test projects

02. Prompts/문서생성/domain/도메인_문서생성_메시지_처리_v01.md

@@ -0,0 +1,3 @@
+    <div class="toast" id="toast">메시지</div>
+    <div class="loading" id="loading"><div class="spinner"></div><div>처리 중...</div></div>
+    <input type="file" id="fileInput" accept=".html,.htm" onchange="handleFile(event)">