feat(router): Register ProcessingIssuesHandler in router configuration

Wire up the ProcessingIssuesHandler throughout the application:

cmd/server/main.go:
- Remove obsolete commented-out getTemplateUserWithTheme function
- Instantiate ProcessingIssuesHandler with database queries
- Add handler to router Config (with field alignment cleanup)

internal/router/router.go:
- Add ProcessingIssuesHandler field to router Config struct
- Reformat Config struct for better field alignment

This enables the processing issues API endpoints for listing and getting
statistics about issues within libraries, integrated with the admin UI.

internal/router/router.go

@@ -36,35 +36,36 @@ func (cv *CustomValidator) Validate(i interface{}) error {
 
 // Config holds all dependencies needed for route registration
 type Config struct {
-	Echo                  *echo.Echo
-	Queries               *database.Queries
-	Cfg                   *config.Config
-	DBPool                interface{} // pgxpool.Pool interface
-	AuthHandler           *handlers.AuthHandler
-	LibraryHandler        *handlers.LibraryHandler
-	DeviceHandler         *handlers.DeviceHandler
-	MediaHandler          *handlers.MediaHandler
-	MatchingHandler       *handlers.MatchingHandler
-	KOReaderHandler       *handlers.KOReaderHandler
-	WSHandler             *handlers.WSHandler
-	ConflictHandler       *handlers.ConflictHandler
-	AnalyticsHandler      *handlers.AnalyticsHandler
-	QueueHandler          *handlers.QueueHandler
-	CollectionHandler     *handlers.CollectionHandler
-	Worker                *services.Worker
-	FiltersHandler        *handlers.FiltersHandler
-	DashboardHandler      *handlers.DashboardHandler
-	DashboardService      *services.DashboardService
-	OPDSHandler           *handlers.OPDSHandler
-	SystemSettingsHandler *handlers.SystemSettingsHandler
-	ConnManager           *sync.ConnectionManager
-	QueueProcessor        *sync.SyncQueueProcessor
-	DeviceAuthMiddleware  *middleware.DeviceAuthMiddleware
-	LoginTracker          *ratelimit.LoginAttemptTracker
-	ScannerHandler        *handlers.Handler
-	JobsHandler           *handlers.JobsHandler
-	SidecarHandler        *handlers.SidecarHandler
-	ReaderHandler         *handlers.ReaderHandler
+	Echo                    *echo.Echo
+	Queries                 *database.Queries
+	Cfg                     *config.Config
+	DBPool                  interface{} // pgxpool.Pool interface
+	AuthHandler             *handlers.AuthHandler
+	LibraryHandler          *handlers.LibraryHandler
+	DeviceHandler           *handlers.DeviceHandler
+	MediaHandler            *handlers.MediaHandler
+	MatchingHandler         *handlers.MatchingHandler
+	ProcessingIssuesHandler *handlers.ProcessingIssuesHandler
+	KOReaderHandler         *handlers.KOReaderHandler
+	WSHandler               *handlers.WSHandler
+	ConflictHandler         *handlers.ConflictHandler
+	AnalyticsHandler        *handlers.AnalyticsHandler
+	QueueHandler            *handlers.QueueHandler
+	CollectionHandler       *handlers.CollectionHandler
+	Worker                  *services.Worker
+	FiltersHandler          *handlers.FiltersHandler
+	DashboardHandler        *handlers.DashboardHandler
+	DashboardService        *services.DashboardService
+	OPDSHandler             *handlers.OPDSHandler
+	SystemSettingsHandler   *handlers.SystemSettingsHandler
+	ConnManager             *sync.ConnectionManager
+	QueueProcessor          *sync.SyncQueueProcessor
+	DeviceAuthMiddleware    *middleware.DeviceAuthMiddleware
+	LoginTracker            *ratelimit.LoginAttemptTracker
+	ScannerHandler          *handlers.Handler
+	JobsHandler             *handlers.JobsHandler
+	SidecarHandler          *handlers.SidecarHandler
+	ReaderHandler           *handlers.ReaderHandler
 }
 
 // createJWTMiddleware creates a JWT middleware with proper user context setup