rero / rero-invenio-thumbnails / 21129132523

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feat(initial): initial commit - RERO Invenio Thumbnails module

Complete implementation of a multi-provider thumbnail retrieval system for RERO Invenio.

Implemented Features:
- Multi-provider architecture with chainable providers (Amazon, Google Books, Google API, Open Library, Files)
- Local file storage provider (FilesProvider) with configurable directory
- HTTP endpoint for serving thumbnails via Flask blueprint
- Comprehensive provider implementations with exception handling
- Full test suite with 50+ test cases across all providers
- Proper Invenio extension initialization and configuration
- Retry logic with exponential backoff for HTTP requests

Providers:
- AmazonProvider: ISBN-13 to ISBN-10 conversion, 14 country codes, 5 image sizes
- GoogleApiProvider: Query Google Books API by ISBN
- GoogleBooksProvider: JSONP-based Google Books preview endpoint
- OpenLibraryProvider: Open Library Covers API integration
- FilesProvider: Local file storage with .jpg/.jpeg/.png support

Configuration:
- RERO_INVENIO_THUMBNAILS_PROVIDERS: List of active providers
- RERO_INVENIO_THUMBNAILS_FILES_DIR: Local directory for thumbnails
- RERO_INVENIO_THUMBNAILS_CACHE: Redis cache configuration

Testing:
- Comprehensive test coverage for all providers
- HTTP endpoint testing with real file operations
- API function testing with mocked providers
- Shared pytest fixtures in conftest.py

Co-Authored-by: Peter Weber <peter.weber@rero.ch>

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