chore: refine database and backup paths in configuration

- Updated `.gitignore` to only exclude `.db` files in the `/data/` directory and preserve backups.
- Modified `docker-compose.yml` to switch database and backup paths to `dev.db`, aligning with the current development setup.

.gitignore

@@ -43,4 +43,5 @@ next-env.d.ts
 /src/generated/prisma
 /prisma/dev.db
 
-/data/*
+/data/*.db
+/data/backups/*