feat: polish & windviz & deploy

docker-compose.staging.yml

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+# Staging: resembles production on a single host — all features enabled
+# (metrics, wind visualization, async predictions) plus a bundled Prometheus
+# so the metrics pipeline can be exercised end to end. Runs non-root like prod.
+#
+#   docker compose -f docker-compose.staging.yml up --build
+#   curl localhost:8080/api/v1/admin/status
+#   open http://localhost:9090   (Prometheus, predictor target should be UP)
+services:
+  init-perms:
+    image: busybox:1.36
+    command: ["sh", "-c", "mkdir -p /data && chown -R 65532:65532 /data"]
+    volumes:
+      - predictor-data:/data
+
+  predictor:
+    build:
+      context: .
+      args:
+        VERSION: staging
+        REVISION: staging
+    image: stratoflights-predictor:staging
+    depends_on:
+      init-perms:
+        condition: service_completed_successfully
+    ports:
+      - "8080:8080"
+    environment:
+      PREDICTOR_DATA_DIR: /data
+      PREDICTOR_METRICS_ENABLED: "true"
+      PREDICTOR_METRICS_PATH: /metrics
+      PREDICTOR_LOG_LEVEL: info
+      PREDICTOR_DOWNLOAD_PARALLEL: "16"
+    volumes:
+      - predictor-data:/data
+      # - ./elevation:/srv/ruaumoko-dataset:ro
+
+  prometheus:
+    image: prom/prometheus:v2.54.1
+    depends_on:
+      - predictor
+    ports:
+      - "9090:9090"
+    volumes:
+      - ./deploy/prometheus.yml:/etc/prometheus/prometheus.yml:ro
+
+volumes:
+  predictor-data: