feat(api): add healthcheck endpoint for monitoring health from Docker/Podman (#2024)

example-docker/docker-compose.yml

@@ -26,6 +26,12 @@ services:
       - ./data:/app/data       # Application data (settings, metadata, cache, etc.). Persist this folder to retain your library state across container restarts.
       - ./books:/books         # Primary book library folder. Mount your collection here so BookLore can access and organize your books.
       - ./bookdrop:/bookdrop   # BookDrop folder. Files placed here are automatically detected and prepared for import.
+    healthcheck:
+      test: wget -q -O - http://localhost:6060/api/v1/healthcheck
+      interval: 60s
+      retries: 5
+      start_period: 60s
+      timeout: 10s
     restart: unless-stopped
 
   mariadb: