fix: add missing queue management routes

Add all queue routes from original main.go:
- /queue/devices/:device_id/stats
- /queue/devices/:device_id/items
- /queue/items/:item_id/retry
- /queue/items/:item_id (DELETE)
- /queue/devices/:device_id/clear
- /queue/items (admin-only GET)

internal/router/queue.go

@@ -2,8 +2,6 @@ package router
 
 import (
 	"bookhoard/internal/handlers"
-
-	"github.com/labstack/echo/v4"
 )
 
 func registerQueueRoutes(cfg *Config) {
@@ -17,10 +15,10 @@ func registerQueueRoutes(cfg *Config) {
 	// Sync queue management routes (protected - require user auth)
 	queue := protected.Group("/queue")
 	queue.GET("/devices/:device_id/stats", cfg.QueueHandler.GetDeviceQueueStats)
-	queue.GET("/devices/:device_id/items", queueHandler.ListDeviceQueueItems)
-	queue.POST("/items/:item_id/retry", queueHandler.RetryQueueItem)
-	queue.DELETE("/items/:item_id", queueHandler.DeleteQueueItem)
-	queue.DELETE("/devices/:device_id/clear", queueHandler.ClearDeviceQueue)
+	queue.GET("/devices/:device_id/items", cfg.QueueHandler.ListDeviceQueueItems)
+	queue.POST("/items/:item_id/retry", cfg.QueueHandler.RetryQueueItem)
+	queue.DELETE("/items/:item_id", cfg.QueueHandler.DeleteQueueItem)
+	queue.DELETE("/devices/:device_id/clear", cfg.QueueHandler.ClearDeviceQueue)
 
 	// Admin-only queue routes
 	adminQueue := queue.Group("", handlers.AdminMiddleware)