added routes package and serve in server package

backend/internal/category/GetAllCategories.go

@@ -1,41 +0,0 @@
-package category
-
-import "backend/model"
-
-func GetAllCategories() ([]model.Category, error) {
-	return []model.Category{
-		{
-			Title: "Electronics",
-			Icon:  "😀",
-			Type:  "expense",
-		},
-		{
-			Title: "Clothing",
-			Icon:  "😁",
-			Type:  "expense",
-		},
-		{
-			Title: "Books",
-			Icon:  "😂",
-			Subcategories: []model.Subcategory{
-				{
-					Title: "Fiction",
-				},
-				{
-					Title: "Non-Fiction",
-				},
-			},
-			Type: "expense",
-		},
-		{
-			Title: "Salary",
-			Icon:  "😀",
-			Type:  "income",
-		},
-		{
-			Title: "asdf",
-			Icon:  "😀",
-			Type:  "income",
-		},
-	}, nil
-}