Implement Monlet MVP stack and UI updates

deploy/docker-compose.showcase.yml

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+# Showcase / e2e override on top of deploy/docker-compose.yml.
+# Usage:
+#   docker compose -f deploy/docker-compose.yml -f deploy/docker-compose.showcase.yml up -d --build
+# Demo agents only — production uses systemd-managed Go binary.
+
+services:
+  server:
+    environment:
+      MONLET_STALE_AFTER_SEC: "20"
+      MONLET_DEAD_AFTER_SEC: "40"
+      MONLET_DETECTOR_TICK_SEC: "5"
+      MONLET_EVENTS_RETENTION_MAX_ROWS: "5000"
+      MONLET_OUTBOX_RETENTION_MAX_ROWS: "1000"
+      MONLET_NOTIFIER_DEBUG_ENABLED: "true"
+      MONLET_NOTIFIER_WEBHOOK_ENABLED: "true"
+      MONLET_NOTIFIER_WEBHOOK_URL: "http://mock-webhook:8080/"
+
+  mock-webhook:
+    image: python:3.14-alpine
+    command: ["python3", "-u", "/opt/mock_webhook.py"]
+    volumes:
+      - ./showcase/mock_webhook.py:/opt/mock_webhook.py:ro
+    healthcheck:
+      test: ["CMD-SHELL", "wget -qO- --post-data='{}' http://localhost:8080/ >/dev/null 2>&1 || true"]
+      interval: 5s
+      timeout: 3s
+      retries: 5
+
+  agent-mixed:
+    image: monlet-showcase-agent
+    build:
+      context: ..
+      dockerfile: deploy/docker/agent.Dockerfile
+    environment:
+      MONLET_CONFIG: /etc/monlet/agent.toml
+    volumes:
+      - ./showcase/agents/mixed.toml:/etc/monlet/agent.toml:ro
+      - ./showcase/checks:/opt/monlet/checks:ro
+    depends_on:
+      server:
+        condition: service_healthy
+    ports:
+      - "9465:9465"
+
+  agent-resolve:
+    image: monlet-showcase-agent
+    environment:
+      MONLET_CONFIG: /etc/monlet/agent.toml
+    volumes:
+      - ./showcase/agents/resolve.toml:/etc/monlet/agent.toml:ro
+      - ./showcase/checks:/opt/monlet/checks:ro
+      - resolve_state:/state
+    depends_on:
+      server:
+        condition: service_healthy
+      agent-mixed:
+        condition: service_started
+
+  agent-prometheus-owned:
+    image: monlet-showcase-agent
+    environment:
+      MONLET_CONFIG: /etc/monlet/agent.toml
+    volumes:
+      - ./showcase/agents/prometheus_owned.toml:/etc/monlet/agent.toml:ro
+      - ./showcase/checks:/opt/monlet/checks:ro
+    depends_on:
+      server:
+        condition: service_healthy
+      agent-mixed:
+        condition: service_started
+
+  agent-stale:
+    image: monlet-showcase-agent
+    environment:
+      MONLET_CONFIG: /etc/monlet/agent.toml
+    volumes:
+      - ./showcase/agents/stale.toml:/etc/monlet/agent.toml:ro
+      - ./showcase/checks:/opt/monlet/checks:ro
+    depends_on:
+      server:
+        condition: service_healthy
+      agent-mixed:
+        condition: service_started
+
+  agent-dead:
+    image: monlet-showcase-agent
+    environment:
+      MONLET_CONFIG: /etc/monlet/agent.toml
+    volumes:
+      - ./showcase/agents/dead.toml:/etc/monlet/agent.toml:ro
+      - ./showcase/checks:/opt/monlet/checks:ro
+    depends_on:
+      server:
+        condition: service_healthy
+      agent-mixed:
+        condition: service_started
+
+  # No depends_on:server — starts in parallel so it must spool events until server is ready.
+  agent-spool-replay:
+    image: monlet-showcase-agent
+    environment:
+      MONLET_CONFIG: /etc/monlet/agent.toml
+    volumes:
+      - ./showcase/agents/spool_replay.toml:/etc/monlet/agent.toml:ro
+      - ./showcase/checks:/opt/monlet/checks:ro
+      - spool_replay_state:/var/lib/monlet-agent
+    depends_on:
+      postgres:
+        condition: service_healthy
+
+volumes:
+  resolve_state:
+  spool_replay_state: