chore: restructure project into backend and frontend folders

- Move all frontend code to frontend/ directory
- Add backend/ with Go project structure (cmd, internal, pkg)
- Add docker-compose.yml for orchestration

backend/internal/db/sqlc/models.go

@@ -0,0 +1,31 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.30.0
+
+package db
+
+import (
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+type Delivery struct {
+	ID              pgtype.UUID        `db:"id" json:"id"`
+	Date            pgtype.Date        `db:"date" json:"date"`
+	PickupLocation  string             `db:"pickup_location" json:"pickup_location"`
+	ProductName     string             `db:"product_name" json:"product_name"`
+	Address         string             `db:"address" json:"address"`
+	Phone           string             `db:"phone" json:"phone"`
+	AdditionalPhone pgtype.Text        `db:"additional_phone" json:"additional_phone"`
+	HasElevator     bool               `db:"has_elevator" json:"has_elevator"`
+	Comment         pgtype.Text        `db:"comment" json:"comment"`
+	Status          string             `db:"status" json:"status"`
+	CreatedAt       pgtype.Timestamptz `db:"created_at" json:"created_at"`
+	UpdatedAt       pgtype.Timestamptz `db:"updated_at" json:"updated_at"`
+}
+
+type User struct {
+	ID           pgtype.UUID      `db:"id" json:"id"`
+	Username     string           `db:"username" json:"username"`
+	PasswordHash string           `db:"password_hash" json:"password_hash"`
+	CreatedAt    pgtype.Timestamp `db:"created_at" json:"created_at"`
+}