feat: integrate ConnectionManager into Handler struct

Add WebSocket ConnectionManager to Handler:
- Add connManager field to Handler struct
- Update NewHandler to accept ConnectionManager parameter
- Update SetupRoutes to pass ConnectionManager through
- Import sync package with alias to avoid conflicts

This enables progress handlers to broadcast updates via WebSocket.

internal/handlers/ebook.go

@@ -3,6 +3,7 @@ package handlers
 import (
 	"bookmann/internal/database"
 	"bookmann/internal/services"
+	wsync "bookmann/internal/sync"
 	"context"
 	"fmt"
 	"net/http"
@@ -31,9 +32,10 @@ type Handler struct {
 	watchModeCtx      context.Context
 	watchModeCancel   context.CancelFunc
 	watchingLibraries map[string]bool
+	connManager       *wsync.ConnectionManager
 }
 
-func NewHandler(db *database.Queries) *Handler {
+func NewHandler(db *database.Queries, connManager *wsync.ConnectionManager) *Handler {
 	ctx, cancel := context.WithCancel(context.Background())
 	worker := services.NewWorker(3)
 	scheduler := services.NewScheduler(worker, db)
@@ -50,6 +52,7 @@ func NewHandler(db *database.Queries) *Handler {
 		watchModeCtx:      watchCtx,
 		watchModeCancel:   watchCancel,
 		watchingLibraries: make(map[string]bool),
+		connManager:       connManager,
 	}
 }
 
@@ -64,8 +67,8 @@ func parseDate(dateStr string) time.Time {
 	return time.Time{}
 }
 
-func SetupRoutes(g *echo.Group, db *database.Queries) *Handler {
-	h := NewHandler(db)
+func SetupRoutes(g *echo.Group, db *database.Queries, connManager *wsync.ConnectionManager) *Handler {
+	h := NewHandler(db, connManager)
 
 	// Media item routes (all authenticated users)
 	g.GET("/media-items", h.ListMediaItems)