Add Claude integration to dashboard

Add comprehensive Claude Code monitoring and realtime streaming to the K8s dashboard.
Includes API endpoints for health, stats, summary, inventory, and live event streaming.
Frontend provides overview, usage, inventory, debug, and live feed views.

dashboard/internal/claude/models.go

@@ -0,0 +1,33 @@
+package claude
+
+type DailyActivity struct {
+	Date          string `json:"date"`
+	MessageCount  int    `json:"messageCount"`
+	SessionCount  int    `json:"sessionCount"`
+	ToolCallCount int    `json:"toolCallCount"`
+}
+
+type DailyModelTokens struct {
+	Date          string         `json:"date"`
+	TokensByModel map[string]int `json:"tokensByModel"`
+}
+
+type ModelUsage struct {
+	InputTokens              int     `json:"inputTokens"`
+	OutputTokens             int     `json:"outputTokens"`
+	CacheReadInputTokens     int     `json:"cacheReadInputTokens"`
+	CacheCreationInputTokens int     `json:"cacheCreationInputTokens"`
+	WebSearchRequests        int     `json:"webSearchRequests"`
+	CostUSD                  float64 `json:"costUSD"`
+	ContextWindow            int     `json:"contextWindow"`
+}
+
+type StatsCache struct {
+	Version          int                   `json:"version"`
+	LastComputedDate string                `json:"lastComputedDate"`
+	DailyActivity    []DailyActivity       `json:"dailyActivity"`
+	DailyModelTokens []DailyModelTokens    `json:"dailyModelTokens"`
+	ModelUsage       map[string]ModelUsage `json:"modelUsage"`
+	TotalSessions    int                   `json:"totalSessions"`
+	TotalMessages    int                   `json:"totalMessages"`
+}