feat: add landing page API info

app.py

@@ -69,6 +69,16 @@ from utils.db import users_col, chats_col, settings_col, is_using_mock
 from utils.pdf_parser import extract_text
 import qa_engine
 
+@app.route("/")
+def index():
+    return jsonify({
+        "message": "SQuAD QA System API is Live",
+        "status": "success",
+        "version": "1.1.0",
+        "models_loaded": ["BERT", "BiLSTM"],
+        "docs": "https://github.com/tnp554/squad-qa-system"
+    })
+
 # ─── Helpers ─────────────────────────────────────────────────────────────────
 
 def _serialize(doc: dict) -> dict: