Refactor: move remote parser, test, and sample to paperless.parsers

Relocates three files to their new homes in the parser plugin system:

- src/paperless_remote/parsers.py
    → src/paperless/parsers/remote.py
- src/paperless_remote/tests/test_parser.py
    → src/paperless/tests/parsers/test_remote_parser.py
- src/paperless_remote/tests/samples/simple-digital.pdf
    → src/paperless/tests/samples/remote/simple-digital.pdf

Content and imports will be updated in the follow-up commit that
rewrites the parser to the new ParserProtocol interface.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/paperless/tests/parsers/test_remote_parser.py

@@ -4,10 +4,10 @@ from unittest import mock
 
 from django.test import TestCase
 from django.test import override_settings
+from paperless_remote.parsers import RemoteDocumentParser
 
 from documents.tests.utils import DirectoriesMixin
 from documents.tests.utils import FileSystemAssertsMixin
-from paperless_remote.parsers import RemoteDocumentParser
 from paperless_remote.signals import get_parser