feat: Enhance card metadata handling, implement persistent Scryfall caching, and update pack generation logic for new booster structure.

docs/development/CENTRAL.md

@@ -28,3 +28,4 @@
 - [Persist Metadata](./devlog/2025-12-16-230000_persist_metadata.md): Completed. Implemented IndexedDB persistence for Scryfall metadata to ensure offline availability and reduce API calls.
 - [Bulk Parse Feedback](./devlog/2025-12-16-231500_bulk_parse_feedback.md): Completed. Updated `CubeManager` to handle metadata generation properly and provide feedback on missing cards.
 - [Full Metadata Passthrough](./devlog/2025-12-16-234500_full_metadata_passthrough.md): Completed. `DraftCard` now includes a `definition` property containing the complete, raw Scryfall object for future-proofing and advanced algorithm usage.
+- [Server-Side Caching](./devlog/2025-12-16-235900_server_side_caching.md): Completed. Implemented logic to cache images and metadata on the server upon bulk parsing, and updated client to use local assets.

docs/development/devlog/2025-12-16-235900_server_side_caching.md

@@ -0,0 +1,25 @@
+# Plan: Server-Side Caching of Bulk Data
+
+## Objective
+Implement server-side caching of both card images and metadata upon bulk parsing, ensuring the application relies on local assets rather than external Scryfall URLs.
+
+## Implementation Steps
+
+1.  **Refactor Server Architecture (`CardService.ts`)**
+    *   Update storage paths to `public/cards/images` (previously `public/cards`) and `public/cards/metadata`.
+    *   Implement `cacheMetadata` to save JSON files alongside images.
+
+2.  **Update API Endpoint (`index.ts`)**
+    *   Modify `POST /api/cards/cache` to handle metadata saving in addition to image downloading.
+    *   Update static file serving to map `/cards` to `public/cards`, making images accessible at `/cards/images/{id}.jpg`.
+
+3.  **Update Client Logic (`CubeManager.tsx`, `PackGeneratorService.ts`, `LobbyManager.tsx`)**
+    *   **Generation**: Pass a flag (`useLocalImages`) to the generator service.
+    *   **Url Construction**: Generator now produces URLs like `${origin}/cards/images/{id}.jpg` when the flag is set.
+    *   **Triggers**: `CubeManager` immediately sends parsed data to the server for caching before generating packs.
+    *   **Consistency**: `LobbyManager` updated to look for images in the new `/cards/images` path for multiplayer sessions.
+
+## Impact
+*   **Performance**: Initial "Parse Bulk" takes slightly longer (due to server cache call), but subsequent interactions are instant and local.
+*   **Reliability**: Application works offline or without Scryfall after initial parse.
+*   **Precision**: Metadata is now persisted as individual JSONs on the backend, ready for future complex backend algorithms.