[FEATURE REQUEST] Add paperlessNGX intégration #1465

Checklist
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• I have read the Contributing Guidelines and Scope and Purpose
• I have searched through existing issues.

Description

I would like to suggest an integration between LubeLogger and Paperless-ngx. Many users self-host both applications, and managing maintenance invoices currently requires double data entry.

This integration could take the following forms (using the Paperless-ngx API):

1. Tag Tracking (Paperless -> LubeLogger): LubeLogger could monitor a specific tag (or tags) in Paperless-ngx. When a document (like a garage invoice) is processed and tagged appropriately in Paperless, LubeLogger could automatically fetch it and create (or suggest) a new repair entry linked to that document.
2. Direct Push (LubeLogger -> Paperless): When creating a repair entry directly in LubeLogger and uploading/scanning a document, there could be an option to push this file directly to the Paperless-ngx instance. LubeLogger could automatically apply predefined tags (e.g., CAR, REPAIR) so the document is centralized in the user's DMS without having to upload it twice.

This would create a seamless workflow for keeping vehicle maintenance records and financial documents perfectly in sync.

Acknowledgment

• I acknowledge that LubeLogger is a side project and that development efforts are entirely voluntary. I do not expect the core maintainers to respond to this issue, and I will not hound or chase them regarding this issue or any other issues.