fix: increase backend start_period to 120s for migrations

The 60s start_period was too short - migrations can take 70+ seconds.
Docker was marking the container unhealthy before migrations completed.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.blue-green.yml

@@ -92,7 +92,7 @@ services:
       interval: 5s
       timeout: 5s
       retries: 5
-      start_period: 60s
+      start_period: 120s
     deploy:
       resources:
         limits:
@@ -183,7 +183,7 @@ services:
       interval: 5s
       timeout: 5s
       retries: 5
-      start_period: 60s
+      start_period: 120s
     deploy:
       resources:
         limits:

docker-compose.yml

@@ -151,7 +151,7 @@ services:
       interval: 5s
       timeout: 5s
       retries: 5
-      start_period: 60s
+      start_period: 120s
     labels:
       - "traefik.enable=true"
       - "traefik.docker.network=motovaultpro_backend"