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>

internal/store/postgres/query.go

@@ -3,6 +3,7 @@ package postgres
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"time"
 )
 
@@ -13,20 +14,39 @@ type EventRow struct {
 	Payload json.RawMessage `json:"payload"`
 }
 
-func (d *DB) ListRecentEvents(ctx context.Context, limit int) ([]EventRow, error) {
-	if limit <= 0 {
-		limit = 100
+type EventsFilter struct {
+	Limit     int
+	EventType string
+	Framework string
+}
+
+func (d *DB) ListRecentEvents(ctx context.Context, f EventsFilter) ([]EventRow, error) {
+	if f.Limit <= 0 {
+		f.Limit = 100
 	}
-	if limit > 1000 {
-		limit = 1000
+	if f.Limit > 1000 {
+		f.Limit = 1000
 	}
 
-	rows, err := d.sql.QueryContext(ctx, `
-select event_id, ts, type, payload
-from events
-order by ts desc
-limit $1
-`, limit)
+	query := "SELECT event_id, ts, type, payload FROM events WHERE 1=1"
+	args := []any{}
+	argN := 1
+
+	if f.EventType != "" {
+		query += fmt.Sprintf(" AND type = $%d", argN)
+		args = append(args, f.EventType)
+		argN++
+	}
+	if f.Framework != "" {
+		query += fmt.Sprintf(" AND source_framework = $%d", argN)
+		args = append(args, f.Framework)
+		argN++
+	}
+
+	query += fmt.Sprintf(" ORDER BY ts DESC LIMIT $%d", argN)
+	args = append(args, f.Limit)
+
+	rows, err := d.sql.QueryContext(ctx, query, args...)
 	if err != nil {
 		return nil, err
 	}
@@ -40,8 +60,5 @@ limit $1
 		}
 		out = append(out, r)
 	}
-	if err := rows.Err(); err != nil {
-		return nil, err
-	}
-	return out, nil
+	return out, rows.Err()
 }