test: add Bruno API test collections for device authentication

- Device token regeneration tests (success, forbidden, not found, unauthorized)
- OPDS authentication tests (Bearer token, query token)
- Kobo sync tests with token authentication
- Test various authentication methods and error cases

cmd/server/tests/kobo_test.go

@@ -1,4 +1,4 @@
-package main
+package bookhoard/cmd/server/tests
 
 import (
 	"bookhoard/internal/handlers"