Redesign Lookup Provider architecture for extensibility and type safety

[wjarka]

redesign Lookup Provider architecture for extensibility and type safety type safety

This refactor modernizes the Barcode Lookup Provider system to improve extensibility, type safety, and maintainability:

Core Architecture Changes:

• Made LookupProvider abstract with required methods (getName, getDescription, getConfigKey) to enforce compile-time contracts for all providers
• Replaced hardcoded provider list with dynamic provider registry in config-dist.php (LOOKUP_PROVIDERS constant) for easier addition of new providers
• Implemented getProviders() factory method in BarcodeLookup to dynamically load providers from configuration

Provider Interface Improvements:

• Added getConfigHtml() method for providers to define their own configuration UI
• Added getConfigFieldId() to identify main config field for dynamic enable/disable
• Added saveSettings() hook for custom provider save logic
• Added setId()/getId() for unique provider identification
• Unified enablement check to single isEnabled() method

Settings UI Enhancements:

• Moved provider-specific configuration fields from settings.php into respective provider classes (better separation of concerns)
• Implemented generic JavaScript handler for toggling config fields based on provider enablement checkbox
• Improved UI layout with proper vertical stacking of provider description and config fields

Code Quality:

• Removed all require_once statements for individual providers from LookupProvider base class (now loaded dynamically)
• Added explicit type casting for EditFieldBuilder output to satisfy Psalm
• Updated Psalm baseline to reflect resolved type issues
• Improved error messages to use getName() instead of property access

This refactor maintains backward compatibility while making it significantly easier to add new lookup providers - developers now only need to:

1. Create a new provider class extending LookupProvider
2. Implement required abstract methods
3. Add entry to LOOKUP_PROVIDERS in config-dist.php

[wjarka]

Hey @Forceu, don't mean to be pushy - just not sure how often you check this section (as there a few PRs sitting there for a while). Would appreciate some feedback if needed and potentially merging it as I would like to add some providers as next steps :)

[wjarka]

Ahh, a quick note - upgrade will require people updating their data/config.php files to move the providers configuration (I kept the IDs the same for backwards compatibility, so the order and enabled / disabled should stay intact).

[Forceu]

Thanks a lot for your PR! At the moment I am unfortunately very busy and don't have as much time for this project as I would like to :/ I will however review this PR as soon as possible

[wjarka]

Thanks a lot for your PR! At the moment I am unfortunately very busy and don't have as much time for this project as I would like to :/ I will however review this PR as soon as possible

No worries, completely understandable. As I am setting myself up with grocy and barcodebuddy - I will be working on some features, so let me know if there is any way I can help :)