Add support for using both echo and custom mission

backend/api/Services/MissionLoaders/EchoAndCustomMissionLoader.cs

@@ -0,0 +1,37 @@
+using Api.Controllers.Models;
+using Api.Database.Models;
+namespace Api.Services.MissionLoaders
+{
+    public class EchoAndCustomMissionLoader(
+        IEchoService echoService,
+        ISourceService sourceService) : IMissionLoader
+    {
+        public async Task<IQueryable<MissionDefinition>> GetAvailableMissions(string? installationCode)
+        {
+            return await echoService.GetAvailableMissions(installationCode);
+        }
+
+        public async Task<MissionDefinition?> GetMissionById(string sourceMissionId)
+        {
+            return await echoService.GetMissionById(sourceMissionId);
+        }
+
+        public async Task<List<MissionTask>> GetTasksForMission(string missionSourceId)
+        {
+            var customMissionTasks = await sourceService.GetMissionTasksFromSourceId(missionSourceId);
+            if (customMissionTasks != null)
+            {
+                return customMissionTasks;
+            }
+            else
+            {
+                return await echoService.GetTasksForMission(missionSourceId);
+            }
+        }
+
+        public async Task<List<PlantInfo>> GetPlantInfos()
+        {
+            return await echoService.GetPlantInfos();
+        }
+    }
+}

backend/api/Services/SourceService.cs

@@ -20,6 +20,8 @@ public interface ISourceService
 
         public abstract Task<Source> CreateSourceIfDoesNotExist(List<MissionTask> tasks, bool readOnly = true);
 
+        public abstract Task<List<MissionTask>?> GetMissionTasksFromSourceId(string id);
+
         public abstract Task<Source?> Delete(string id);
 
         public void DetachTracking(Source source);

backend/api/appsettings.json

@@ -36,7 +36,7 @@
     "ConnectionString": ""
   },
   "MissionLoader": {
-    "FileName": "Api.Services.MissionLoaders.EchoMissionLoader"
+    "FileName": "Api.Services.MissionLoaders.EchoAndCustomMissionLoader"
   },
   "KeyVault": {
     "UseKeyVault": true