Plugin framework for photo source backends: - PhotoProvider ABC with lifecycle hooks, auth flow, cache control - @register_provider decorator + registry for auto-discovery - ProviderManager handles instance lifecycle, config persistence, aggregated photo pool with weighted random selection - ProviderCache: in-memory list cache (per-provider TTL), disk-based thumbnail cache, optional full image cache for remote providers - Per-image settings migrated from bare filenames to composite keys (provider_id:photo_id) with automatic one-time migration + backup Local directory provider included as reference implementation — wraps the existing filesystem logic into the provider interface with upload and delete support. All existing endpoints preserved with composite key routing. ESP32 firmware unchanged — still hits GET /photo, gets a JPEG. New API: /api/providers/* for managing provider instances, auth flows, and cache control. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Description
E-Ink Spectra 6 photo frame — ESP32-S3 firmware + photo server
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