Add project and task management with scheduling and notifications

Introduced `Project` and `Task` entities, along with supporting services, repositories, and APIs. Added features for project-based and household-level task management, including creation, listing, updates, and validation. Implemented scheduled notifications for tasks due tomorrow. Updated Flyway migrations, configuration files, and tests to support these functionalities.

src/main/resources/application.yml

@@ -16,3 +16,9 @@ spring:
       resourceserver:
         jwt:
           jwk-set-uri: http://keycloak:8081/realms/hemhub/protocol/openid-connect/certs
+hemhub:
+  schedule:
+    reminders:
+      # Default: every day at 08:00
+      cron: "0 0 8 * * *"
+