Fix MTGJSON download: use .gz URLs and handle pre-uncompressed files

state.json

@@ -1,6 +1,6 @@
 {
   "task_description": "MTG Online Backend - MTGJSON Data Integration & Docker Deployment",
-  "current_step": "Testing: destroy all containers, rebuild backend, deploy stack",
+  "current_step": "Testing full container lifecycle",
   "files_created": [
     "backend/app/services/mtgjson_manager.py",
     "backend/scripts/sanity_check_mtgjson.py",
@@ -26,17 +26,18 @@
     "Implemented retry logic with exponential backoff (up to 3 attempts)",
     "Cleanup deletes corrupted data before retry",
     "Container marked unhealthy if validation fails after all retries",
-    "Doubled all timeout values to prevent timeouts during download/upsert",
     "Download timeout increased to 60 minutes (3600s) for large files"
   ],
   "next_steps": [
-    "Destroy all containers",
-    "Build backend image",
-    "Deploy stack",
-    "Monitor until healthy",
-    "Check logs for success"
+    "Save state to state.json",
+    "Commit and push to Gitea",
+    "Stop and destroy all Docker containers",
+    "Build backend Docker container",
+    "Deploy stack and monitor",
+    "Check container health status",
+    "Verify logs show successful initialization"
   ],
   "blockers": [],
-  "commit_hash": "20fb572",
+  "commit_hash": "0643544",
   "timestamp": 1784598400
 }