feat: complete agent monitoring - hook, UI, and backend filter

- Add event_type and framework filters to events query endpoint
- Add /agents SPA route to web-ui server
- Add Agents nav link and route in frontend
- Add agents page CSS (timeline, VM pills, stats panel)
- Build VM status strip, activity timeline, and real-time stats
- Add agentmon hook for OpenClaw (HOOK.md + handler.ts)
- Add docker-compose, Dockerfile, and supporting infra files

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,37 @@
+FROM golang:1.25 AS builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o /usr/local/bin/ingest-gateway ./cmd/ingest-gateway
+RUN CGO_ENABLED=0 GOOS=linux go build -o /usr/local/bin/query-api ./cmd/query-api
+RUN CGO_ENABLED=0 GOOS=linux go build -o /usr/local/bin/web-ui ./cmd/web-ui
+RUN CGO_ENABLED=0 GOOS=linux go build -o /usr/local/bin/event-processor ./cmd/event-processor
+RUN CGO_ENABLED=0 GOOS=linux go build -o /usr/local/bin/openclaw-monitor ./cmd/openclaw-monitor
+
+FROM debian:bookworm-slim
+
+RUN apt-get update && apt-get install -y \
+    ca-certificates \
+    libvirt-clients \
+    openssh-client \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY --from=builder /usr/local/bin/* /usr/local/bin/
+
+ENV AGENTMON_ADDR=:8080
+ENV AGENTMON_QUERY_ADDR=:8081
+ENV AGENTMON_UI_ADDR=:8082
+ENV DATABASE_URL=postgres://postgres:pass@postgres:5432/agentmon?sslmode=disable
+ENV NATS_URL=nats://nats:4222
+ENV NATS_TOPIC=agentmon.events.v1
+ENV OPENCLAW_REGISTRY=/openclaw-registry/openclaw-instances.json
+ENV POLL_INTERVAL=30s
+
+CMD ["ingest-gateway"]