Map admins: owners invite friends to co-manage maps

Owners can invite players by name from the map workshop; invitees accept
from their dashboard and then manage the map (details, locations,
submission, refresh, contributions, appeals) through owner-delegated
checks. Adds the map_admins table, invite/admin API endpoints, dashboard
invite box, workshop admin management, and Russian translations.

shared/database.ts

@@ -367,6 +367,44 @@ export type Database = {
         Update: Partial<AppealRecord>;
         Relationships: [];
       };
+      map_admins: {
+        Row: {
+          created_at: string;
+          dataset_id: string;
+          id: string;
+          invited_by: string;
+          responded_at: string | null;
+          state: string;
+          user_id: string;
+        };
+        Insert: {
+          created_at?: string;
+          dataset_id: string;
+          id?: string;
+          invited_by: string;
+          responded_at?: string | null;
+          state?: string;
+          user_id: string;
+        };
+        Update: {
+          created_at?: string;
+          dataset_id?: string;
+          id?: string;
+          invited_by?: string;
+          responded_at?: string | null;
+          state?: string;
+          user_id?: string;
+        };
+        Relationships: [
+          {
+            foreignKeyName: "map_admins_dataset_id_fkey";
+            columns: ["dataset_id"];
+            isOneToOne: false;
+            referencedRelation: "datasets";
+            referencedColumns: ["id"];
+          },
+        ];
+      };
       catalog_servers: {
         Row: {
           address: string | null;