added backend and 2 endpoints fetch

backend/.gitignore

@@ -0,0 +1,2 @@
+go.sum
+backend

backend/api/GetAllCategories.go

@@ -0,0 +1,17 @@
+package api
+
+import (
+	"backend/internal/category"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func GetAllCategories(c *fiber.Ctx) error {
+	categories, err := category.GetAllCategories()
+	if err != nil {
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+	return c.JSON(categories)
+}

backend/api/GetAllOperation.go

@@ -0,0 +1,17 @@
+package api
+
+import (
+	"backend/internal/operation"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func GetAllOperation(c *fiber.Ctx) error {
+	operations, err := operation.GetAllOperation()
+	if err != nil {
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+	return c.JSON(operations)
+}

backend/go.mod

@@ -0,0 +1,24 @@
+module backend
+
+go 1.24.5
+
+require (
+	github.com/gofiber/fiber v1.14.6
+	github.com/gofiber/fiber/v2 v2.52.9
+)
+
+require (
+	github.com/andybalholm/brotli v1.1.0 // indirect
+	github.com/gofiber/utils v0.0.10 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/gorilla/schema v1.1.0 // indirect
+	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/rivo/uniseg v0.2.0 // indirect
+	github.com/valyala/bytebufferpool v1.0.0 // indirect
+	github.com/valyala/fasthttp v1.51.0 // indirect
+	github.com/valyala/tcplisten v1.0.0 // indirect
+	golang.org/x/sys v0.28.0 // indirect
+)

backend/internal/category/GetAllCategories.go

@@ -0,0 +1,33 @@
+package category
+
+import "backend/model"
+
+func GetAllCategories() ([]model.Category, error) {
+	return []model.Category{
+		{
+			ID:    "1",
+			Title: "Electronics",
+			Icon:  "😀",
+		},
+		{
+			ID:    "2",
+			Title: "Clothing",
+			Icon:  "😁",
+		},
+		{
+			ID:    "3",
+			Title: "Books",
+			Icon:  "😂",
+			Subcategories: []model.Subcategory{
+				{
+					ID:    "1",
+					Title: "Fiction",
+				},
+				{
+					ID:    "2",
+					Title: "Non-Fiction",
+				},
+			},
+		},
+	}, nil
+}

backend/internal/operation/GetAllOperation.go

@@ -0,0 +1,30 @@
+package operation
+
+import "backend/model"
+
+func GetAllOperation() ([]model.Operation, error) {
+	return []model.Operation{
+		{
+			ID:       "1",
+			Title:    "Operation 1",
+			Amount:   100,
+			Category: "Category 1",
+			SubCategory: model.Subcategory{
+				ID:    "1",
+				Title: "subcategory",
+			},
+			Date: "2022-01-01T00:00:00Z",
+			Type: "income",
+			Icon: "😀",
+		},
+		{
+			ID:       "2",
+			Title:    "Operation 2",
+			Amount:   200,
+			Category: "Category 2",
+			Date:     "2022-01-02T00:00:00Z",
+			Type:     "expense",
+			Icon:     "😂",
+		},
+	}, nil
+}

backend/main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"backend/server"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func main() {
+	app := fiber.New()
+
+	server.Configure(app)
+
+	app.Listen(":3000")
+}

backend/model/category.go

@@ -0,0 +1,8 @@
+package model
+
+type Category struct {
+	ID            string        `json:"id"`
+	Icon          string        `json:"icon"`
+	Title         string        `json:"title"`
+	Subcategories []Subcategory `json:"subcategories"`
+}

backend/model/operation.go

@@ -0,0 +1,13 @@
+package model
+
+type Operation struct {
+	ID          string      `json:"id"`
+	Title       string      `json:"title"`
+	Amount      float64     `json:"amount"`
+	Category    string      `json:"category"`
+	SubCategory Subcategory `json:"subcategory,omitzero"`
+	Note        string      `json:"note,omitempty"`
+	Icon        string      `json:"icon"`
+	Type        string      `json:"type"`
+	Date        string      `json:"date"`
+}

backend/model/subcategory.go

@@ -0,0 +1,6 @@
+package model
+
+type Subcategory struct {
+	ID    string `json:"id"`
+	Title string `json:"title"`
+}

backend/server/configure.go

@@ -0,0 +1,18 @@
+package server
+
+import (
+	"backend/api"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func Configure(app *fiber.App) {
+	app.Static("/", "../frontend/build")
+	apiGroup := app.Group("/api")
+
+	operationGroup := apiGroup.Group("/operation")
+	operationGroup.Get("/", api.GetAllOperation)
+
+	categoryGroup := apiGroup.Group("/category")
+	categoryGroup.Get("/", api.GetAllCategories)
+}