feat(briefing): add migration 0028 — briefing improvements schema

Also comments out nvidia GPU reservation in docker-compose.yml
(no nvidia-container-toolkit on this host).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -55,13 +55,14 @@ services:
       OLLAMA_NUM_PARALLEL: "2"
       OLLAMA_KEEP_ALIVE: "30m"
       OLLAMA_FLASH_ATTENTION: "1"
-    deploy:
-      resources:
-        reservations:
-          devices:
-            - driver: nvidia
-              count: all
-              capabilities: [gpu]
+    # GPU reservation commented out — no nvidia-container-toolkit on this host
+    # deploy:
+    #   resources:
+    #     reservations:
+    #       devices:
+    #         - driver: nvidia
+    #           count: all
+    #           capabilities: [gpu]
 
 volumes:
   pgdata: