feat: add health check endpoint and improve landing page footer

Author: Astroidkiller

backend/app/main.py

@@ -42,6 +42,13 @@ async def startup_event():
         logger.error(f"Knowledge base initialization failed: {result['message']}")
 
 
+
+@app.get("/health", tags=["Health"])
+async def health_check():
+    """Health check endpoint to verify the API is running correctly."""
+    return {"status": "ok", "app": "VCell AI Backend", "version": "1.0.0"}
+
+
 # CORS setup
 app.add_middleware(
     CORSMiddleware,

frontend/app/page.tsx

@@ -177,7 +177,17 @@ export default function LandingPage() {
 
       {/* Footer */}
       <footer className="text-center border-t border-slate-200 text-sm">
-        <p className="text-slate-500 my-4">VCell AI Model Explorer</p>
+        <p className="text-slate-500 my-4">
+          © {new Date().getFullYear()} VCell AI Model Explorer ·{" "}
+          <a
+            href="https://github.com/virtualcell/VCell-AI"
+            target="_blank"
+            rel="noopener noreferrer"
+            className="text-blue-600 hover:underline"
+          >
+            GitHub
+          </a>
+        </p>
       </footer>
     </div>
   );