feat: collect khata-app lib, api and wiki

_index/index.html

@@ -82,6 +82,15 @@
 <section class="section">
 <h2>Apps</h2>
 <div class="grid">
+  <div class="card">
+    <h3>Khata App</h3>
+    <p>OpenAPI-first expenses & cashflow service — ingestion, enrichment, and reporting on MongoDB.</p>
+    <div class="card-actions">
+      <a href="/khata-app/api/" target="_blank">view api</a>
+      <a href="/khata-app/wiki/" target="_blank">view wiki</a>
+      <a href="/khata-app/lib/" target="_blank">view lib</a>
+    </div>
+  </div>
   <div class="card">
     <h3>Blog API</h3>
     <p>A modular, async Blog API backend for FastAPI microservices. Provides streamlined CRUD operations for articles and authors.</p>