Remove preset services and move to MariaDB

TODO.md

@@ -4,10 +4,10 @@ Concrete follow-up work for Jellomator.
 
 ## P0
 
-- Add a backup and restore flow for `jellomator.sqlite` in the admin UI.
+- Add a backup and restore flow for the database in the admin UI.
   - Let an admin download the current database.
   - Let an admin upload a replacement database after confirmation.
-  - Validate that the uploaded file is SQLite before swapping it in.
+  - Validate the uploaded file before swapping it in.
 - Add a basic health endpoint for Docker and orchestration.
   - Return `200` when the app can read and write the database.
   - Return `503` if startup initialization or DB access fails.
@@ -21,7 +21,7 @@ Concrete follow-up work for Jellomator.
 ## P1
 
 - Add drag-and-drop ordering for service cards.
-  - Persist display order in SQLite.
+  - Persist display order in the database.
   - Support moving a card up, down, or to the top in admin.
 - Add a featured/pinned flag for important links.
   - Keep pinned links above the normal list.
@@ -41,9 +41,6 @@ Concrete follow-up work for Jellomator.
 
 ## P2
 
-- Add more presets for common self-hosted apps.
-  - Suggested first set: Paperless-ngx, Immich, Grafana, Home Assistant, Vaultwarden.
-  - Make each preset editable after insertion.
 - Add JSON import/export for services.
   - Include metadata and icon blobs in the export format.
   - Support importing a whole dashboard from a single file.
@@ -63,5 +60,4 @@ Concrete follow-up work for Jellomator.
 - Add a toast system for save, delete, and upload actions.
 - Add Open Graph metadata for better link previews.
 - Add structured JSON logging for auth and CRUD events.
-- Add a small command or script to reset seed data for local development.
 - Add a CI verification step that builds the container image after publish.