Update project documentation and improve frontend functionality

- Updated the backend documentation in CONTRIBUTING.md and README.md to reflect changes in application structure and API endpoints.
- Enhanced the frontend components in MapView.vue for better handling of context menu actions.
- Added new types and interfaces in TypeScript for improved type safety in the frontend.
- Introduced new utility classes for managing characters and markers in the map.
- Updated .gitignore to include .vscode directory for better development environment management.

internal/app/client_markers.go

@@ -0,0 +1,82 @@
+package app
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"strconv"
+
+	"go.etcd.io/bbolt"
+)
+
+func (a *App) uploadMarkers(rw http.ResponseWriter, req *http.Request) {
+	defer req.Body.Close()
+	markers := []struct {
+		Name   string
+		GridID string
+		X, Y   int
+		Image  string
+		Type   string
+		Color  string
+	}{}
+	buf, err := io.ReadAll(req.Body)
+	if err != nil {
+		log.Println("Error reading marker json: ", err)
+		return
+	}
+	err = json.Unmarshal(buf, &markers)
+	if err != nil {
+		log.Println("Error decoding marker json: ", err)
+		log.Println("Original json: ", string(buf))
+		return
+	}
+	err = a.db.Update(func(tx *bbolt.Tx) error {
+		mb, err := tx.CreateBucketIfNotExists([]byte("markers"))
+		if err != nil {
+			return err
+		}
+		grid, err := mb.CreateBucketIfNotExists([]byte("grid"))
+		if err != nil {
+			return err
+		}
+		idB, err := mb.CreateBucketIfNotExists([]byte("id"))
+		if err != nil {
+			return err
+		}
+
+		for _, mraw := range markers {
+			key := []byte(fmt.Sprintf("%s_%d_%d", mraw.GridID, mraw.X, mraw.Y))
+			if grid.Get(key) != nil {
+				continue
+			}
+			if mraw.Image == "" {
+				mraw.Image = "gfx/terobjs/mm/custom"
+			}
+			id, err := idB.NextSequence()
+			if err != nil {
+				return err
+			}
+			idKey := []byte(strconv.Itoa(int(id)))
+			m := Marker{
+				Name:   mraw.Name,
+				ID:     int(id),
+				GridID: mraw.GridID,
+				Position: Position{
+					X: mraw.X,
+					Y: mraw.Y,
+				},
+				Image: mraw.Image,
+			}
+			raw, _ := json.Marshal(m)
+			grid.Put(key, raw)
+			idB.Put(idKey, key)
+		}
+		return nil
+	})
+	if err != nil {
+		log.Println("Error update db: ", err)
+		return
+	}
+}