fix(dashboards): populate empty dashboard panels + tpm-metrics service + dep fixes

- Build out Network Performance Health dashboard (8 panels: stat + timeseries)
  covering active nodes, FL rounds, accuracy, loss, round duration, round rate
- Build out Consensus Trust Monitoring dashboard (9 panels: stat + timeseries)
  covering tpm trust chain, cert counts, node trust scores, message signing/
  verification rates, failure rates, latency, and cert expiry
- Copy both dashboards into grafana/provisioning/dashboards/ so they are
  auto-provisioned in all docker-compose environments
- docker-compose.full.yml: add tpm-metrics exporter service (port 9091) with
  health check, tpm-certs named volume, and dependency on backend
- requirements.txt + requirements-backend.txt: pin flwr==1.7.0 (stable release),
  numpy==1.26.4 (compatibility with scipy/sklearn)
- sovereignmap_production_backend_v2.py: run Flask metrics in daemon thread so
  Flower stays on main thread (required for signal handler registration)

Author: rwilliamspbg-ops

docker-compose.full.yml

@@ -156,6 +156,34 @@ services:
         max-size: "10m"
         max-file: "3"
 
+  tpm-metrics:
+    image: python:3.11-slim
+    container_name: sovereign-tpm-metrics
+    volumes:
+      - ./tpm_metrics_exporter.py:/app/tpm_metrics_exporter.py:ro
+      - ./tpm_cert_manager.py:/app/tpm_cert_manager.py:ro
+      - tpm-certs:/etc/sovereign/certs
+    working_dir: /app
+    command: ["sh", "-c", "python -m pip install --no-cache-dir prometheus-client flask cryptography && python tpm_metrics_exporter.py"]
+    ports:
+      - "9091:9091"
+    networks:
+      - sovereign-network
+    depends_on:
+      - backend
+    healthcheck:
+      test: ["CMD", "python", "-c", "import urllib.request; urllib.request.urlopen('http://localhost:9091/health', timeout=3)"]
+      interval: 10s
+      timeout: 5s
+      retries: 3
+      start_period: 20s
+    restart: unless-stopped
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "10m"
+        max-file: "3"
+
   grafana:
     image: grafana/grafana:10.2.3
     container_name: sovereign-grafana
@@ -217,6 +245,8 @@ volumes:
     driver: local
   alertmanager-data:
     driver: local
+  tpm-certs:
+    driver: local
 
 # ========================================================================
 # NETWORKS