feat: implement order workflow, metrics, and handler unit tests

- implement UpdateOrderStatus and GetOrdersReport service methods
- implement all order, user handlers (UpdateMe, GetMyTrips, CancelOrder, GetOrder, etc.)
- extract OrderServicer interface for testability
- add Prometheus metrics middleware (requests total, duration)
- fix GetAll storage flavor for PostgreSQL ($1 placeholders)
- add 17 unit tests for order handlers via httptest
- wire Grafana datasource and update Prometheus scrape config
- update README with full API reference, pricing, roles, monitoring

internal/handler/route.go

@@ -1,11 +1,26 @@
 package handler
 
 import (
+	"log/slog"
 	"net/http"
 
+	"github.com/anxi0uz/logiflow/internal/models"
+	storage "github.com/anxi0uz/logiflow/pkg"
+	"github.com/huandu/go-sqlbuilder"
 	openapi_types "github.com/oapi-codegen/runtime/types"
 )
 
-func (s *Server) GetRoute(w http.ResponseWriter, r *http.Request, id openapi_types.UUID) {}
+func (s *Server) GetRoute(w http.ResponseWriter, r *http.Request, id openapi_types.UUID) {
+	ctx := r.Context()
+	route, err := storage.GetOne[models.Route](ctx, s.DB, "routes", func(sb *sqlbuilder.SelectBuilder) {
+		sb.Where(sb.EQ("order_id", id))
+	})
+	if err != nil {
+		slog.ErrorContext(ctx, "Error while getting route", slog.String("error", err.Error()))
+		s.JSON(w, r, http.StatusInternalServerError, MsgInternalError, RespError)
+		return
+	}
+	s.JSON(w, r, http.StatusOK, route, RespSuccess)
+}
 
 func (s *Server) RouteWebSocket(w http.ResponseWriter, r *http.Request, id openapi_types.UUID) {}