fix: pin Seq to 2024 image, add no-auth flag, restore dedicated Seq service

- datalust/seq:latest (2025.x) requires mandatory auth — pin to :2024
- Add SEQ_FIRSTRUN_NOAUTHENTICATION=true to match ItemTracker pattern
- Seq UI on port 5342, api/worker point to internal http://seq
- Restore notification_seq volume

Ref: IT-628

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

docker/environments/docker-compose.Development.yml

@@ -3,7 +3,7 @@ services:
     environment:
       - ASPNETCORE_ENVIRONMENT=Development
       - App__ConnectionString=Host=db;Port=5432;Database=notification_service;Username=postgres;Password=postgres
-      - Serilog__WriteTo__1__Args__serverUrl=http://host.docker.internal:5341
+      - Serilog__WriteTo__1__Args__serverUrl=http://seq
     ports:
       - "5200:8080"
 
@@ -11,7 +11,7 @@ services:
     environment:
       - DOTNET_ENVIRONMENT=Development
       - App__ConnectionString=Host=db;Port=5432;Database=notification_service;Username=postgres;Password=postgres
-      - Serilog__WriteTo__1__Args__serverUrl=http://host.docker.internal:5341
+      - Serilog__WriteTo__1__Args__serverUrl=http://seq
 
   db:
     image: postgres:17
@@ -24,5 +24,16 @@ services:
     volumes:
       - notification_db:/var/lib/postgresql/data
 
+  seq:
+    image: datalust/seq:2024
+    environment:
+      ACCEPT_EULA: "Y"
+      SEQ_FIRSTRUN_NOAUTHENTICATION: "true"
+    ports:
+      - "5342:80"
+    volumes:
+      - notification_seq:/data
+
 volumes:
-  notification_db:
+  notification_db:
+  notification_seq: