fix: Rename compose.yml to compose.yaml for Komodo compatibility

Komodo Resource Sync expects compose.yaml (not .yml)
All 22 stack compose files renamed for consistency

stacks/backrest/compose.yaml

@@ -0,0 +1,25 @@
+services:
+  backrest:
+    image: ghcr.io/gabm/backrest:latest
+    container_name: backrest
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:8080:8080"
+    volumes:
+      - backrest_config:/config
+      - /backups:/backups
+    networks:
+      - backrest-network
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/api/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+
+volumes:
+  backrest_config:
+
+networks:
+  backrest-network:
+    driver: bridge