feat(usage): add support for detailed token breakdown in usage tracking

- Introduced `CacheReadTokens` and `CacheCreationTokens` to enhance token breakdown.
- Refactored `parseClaudeUsageNode` for cleaner and reusable logic.
- Adjusted helpers and updated token calculations to align with the new fields.

sdk/cliproxy/usage/manager.go

@@ -34,11 +34,13 @@ type Failure struct {
 
 // Detail holds the token usage breakdown.
 type Detail struct {
-	InputTokens     int64
-	OutputTokens    int64
-	ReasoningTokens int64
-	CachedTokens    int64
-	TotalTokens     int64
+	InputTokens         int64
+	OutputTokens        int64
+	ReasoningTokens     int64
+	CachedTokens        int64
+	CacheReadTokens     int64
+	CacheCreationTokens int64
+	TotalTokens         int64
 }
 
 type requestedModelAliasContextKey struct{}