feat(redis): implement Pub/Sub support for usage tracking

- Added Redis Pub/Sub capability to broadcast usage updates to subscribed clients.
- Enhanced `redisqueue` with subscriber management and message broadcasting.
- Updated tests to validate Pub/Sub message handling, subscription behavior, and fallback to the queue after unsubscribing.
- Integrated `project_id` parsing into auth-files logic to include project identifiers in metadata.

internal/api/handlers/management/auth_files.go

@@ -333,6 +333,9 @@ func (h *Handler) listAuthFilesFromDisk(c *gin.Context) {
 				emailValue := gjson.GetBytes(data, "email").String()
 				fileData["type"] = typeValue
 				fileData["email"] = emailValue
+				if projectID := strings.TrimSpace(gjson.GetBytes(data, "project_id").String()); projectID != "" {
+					fileData["project_id"] = projectID
+				}
 				if pv := gjson.GetBytes(data, "priority"); pv.Exists() {
 					switch pv.Type {
 					case gjson.Number:
@@ -394,6 +397,9 @@ func (h *Handler) buildAuthFileEntry(auth *coreauth.Auth) gin.H {
 	if email := authEmail(auth); email != "" {
 		entry["email"] = email
 	}
+	if projectID := authProjectID(auth); projectID != "" {
+		entry["project_id"] = projectID
+	}
 	if accountType, account := auth.AccountInfo(); accountType != "" || account != "" {
 		if accountType != "" {
 			entry["account_type"] = accountType
@@ -468,6 +474,28 @@ func (h *Handler) buildAuthFileEntry(auth *coreauth.Auth) gin.H {
 	return entry
 }
 
+func authProjectID(auth *coreauth.Auth) string {
+	if auth == nil {
+		return ""
+	}
+	if auth.Metadata != nil {
+		if v, ok := auth.Metadata["project_id"].(string); ok {
+			if projectID := strings.TrimSpace(v); projectID != "" {
+				return projectID
+			}
+		}
+	}
+	if auth.Attributes != nil {
+		if projectID := strings.TrimSpace(auth.Attributes["project_id"]); projectID != "" {
+			return projectID
+		}
+		if projectID := strings.TrimSpace(auth.Attributes["gemini_virtual_project"]); projectID != "" {
+			return projectID
+		}
+	}
+	return ""
+}
+
 func extractCodexIDTokenClaims(auth *coreauth.Auth) gin.H {
 	if auth == nil || auth.Metadata == nil {
 		return nil