Enhance API and frontend components for character management and map visibility

- Updated API documentation to include `ownedByMe` field in character responses, indicating if a character was last updated by the current user's tokens.
- Modified MapView component to track and display the live status based on user-owned characters.
- Enhanced map data handling to exclude hidden maps for non-admin users and improved character icon representation on the map.
- Refactored character data structures to support new properties and ensure accurate rendering in the frontend.

internal/app/handlers/client.go

@@ -1,6 +1,7 @@
 package handlers
 
 import (
+	"context"
 	"encoding/json"
 	"io"
 	"log/slog"
@@ -26,7 +27,8 @@ func (h *Handlers) ClientRouter(rw http.ResponseWriter, req *http.Request) {
 		rw.WriteHeader(http.StatusUnauthorized)
 		return
 	}
-	_ = username
+	ctx = context.WithValue(ctx, app.ClientUsernameKey, username)
+	req = req.WithContext(ctx)
 
 	switch matches[2] {
 	case "locate":