feat(auth): add recent activity logging to access tracker

* Introduced AccessLogEntry type for logging access details
* Updated AccessTracker to maintain a recent activity log
* Modified Metrics to include recent activity log in response
* Added RecentActivityLog component to display logged activities

internal/auth/access_tracker.go

@@ -17,12 +17,24 @@ type AccessSnapshot struct {
 	LastAccessedAt time.Time `json:"last_accessed_at"`
 }
 
+const maxRecentLog = 100
+
+type AccessLogEntry struct {
+	Timestamp time.Time `json:"timestamp"`
+	KeyID     string    `json:"key_id"`
+	IP        string    `json:"ip"`
+	UserAgent string    `json:"user_agent"`
+	Tool      string    `json:"tool"`
+	Path      string    `json:"path"`
+}
+
 type AccessTracker struct {
 	mu            sync.RWMutex
 	entries       map[string]AccessSnapshot
 	ipCounts      map[string]int
 	agentCounts   map[string]int
 	toolCounts    map[string]int
+	recentLog     []AccessLogEntry
 	totalRequests int
 }
 
@@ -32,6 +44,7 @@ func NewAccessTracker() *AccessTracker {
 		ipCounts:    make(map[string]int),
 		agentCounts: make(map[string]int),
 		toolCounts:  make(map[string]int),
+		recentLog:   make([]AccessLogEntry, 0, maxRecentLog),
 	}
 }
 
@@ -64,6 +77,19 @@ func (t *AccessTracker) Record(keyID, path, remoteAddr, userAgent, toolName stri
 	if tool := strings.TrimSpace(toolName); tool != "" {
 		t.toolCounts[tool]++
 	}
+
+	logEntry := AccessLogEntry{
+		Timestamp: now.UTC(),
+		KeyID:     keyID,
+		IP:        normalizedRemoteAddr,
+		UserAgent: userAgent,
+		Tool:      strings.TrimSpace(toolName),
+		Path:      path,
+	}
+	t.recentLog = append([]AccessLogEntry{logEntry}, t.recentLog...)
+	if len(t.recentLog) > maxRecentLog {
+		t.recentLog = t.recentLog[:maxRecentLog]
+	}
 }
 
 func normalizeRemoteAddr(value string) string {
@@ -130,6 +156,7 @@ type AccessMetrics struct {
 	TopIPs           []RequestAggregate `json:"top_ips"`
 	TopAgents        []RequestAggregate `json:"top_agents"`
 	TopTools         []RequestAggregate `json:"top_tools"`
+	RecentLog        []AccessLogEntry   `json:"recent_log"`
 }
 
 func (t *AccessTracker) Metrics(topN int) AccessMetrics {
@@ -143,6 +170,9 @@ func (t *AccessTracker) Metrics(topN int) AccessMetrics {
 	t.mu.RLock()
 	defer t.mu.RUnlock()
 
+	log := make([]AccessLogEntry, len(t.recentLog))
+	copy(log, t.recentLog)
+
 	return AccessMetrics{
 		TotalRequests:    t.totalRequests,
 		UniquePrincipals: len(t.entries),
@@ -152,6 +182,7 @@ func (t *AccessTracker) Metrics(topN int) AccessMetrics {
 		TopIPs:           topAggregates(t.ipCounts, topN),
 		TopAgents:        topAggregates(t.agentCounts, topN),
 		TopTools:         topAggregates(t.toolCounts, topN),
+		RecentLog:        log,
 	}
 }