feat(backend/routes): Add API router for tumor, pneumonia, Alzheimer's, and disease insights

routes/router.py

@@ -0,0 +1,21 @@
+# app/routes/router.py
+from fastapi import APIRouter
+from api import tumor, pneumonia, alzheimers, disease
+
+api_router = APIRouter()
+api_router.include_router(
+    tumor.router,
+    prefix="/tumor",
+)  # Tumor Insight
+api_router.include_router(
+    pneumonia.router,
+    prefix="/pneumonia",
+)  # Pneumonia Insight
+api_router.include_router(
+    alzheimers.router,
+    prefix="/alzheimers",
+)  # Alzheimer Insight
+api_router.include_router(
+    disease.router,
+    prefix="/disease",
+)  # General Disease Classification