feat: implement Blazor web interface for GM session management

- Created GmRelay.Web project (Blazor Server)
- Created GmRelay.Shared library for domain models and rendering
- Refactored GmRelay.Bot to use the Shared library
- Integrated Telegram Login widget with server-side HMAC verification
- Added Dashboard, Group Details, and Edit Session pages
- Enabled bot notifications and in-place message updates from web actions
- Updated .NET Aspire orchestration and Docker Compose configuration

compose.yaml

@@ -31,6 +31,21 @@ services:
       - "ConnectionStrings__gmrelaydb=Host=127.0.0.1;Port=5432;Database=gmrelay_db;Username=gmrelay;Password=${POSTGRES_PASSWORD}"
       - "Telegram__BotToken=${TELEGRAM_BOT_TOKEN}"
 
+  web:
+    build:
+      context: .
+      dockerfile: src/GmRelay.Web/Dockerfile
+    container_name: gmrelay_web
+    restart: always
+    network_mode: host
+    depends_on:
+      db:
+        condition: service_healthy
+    environment:
+      - "ConnectionStrings__gmrelaydb=Host=127.0.0.1;Port=5432;Database=gmrelay_db;Username=gmrelay;Password=${POSTGRES_PASSWORD}"
+      - "Telegram__BotToken=${TELEGRAM_BOT_TOKEN}"
+      - "Telegram__BotUsername=YOUR_BOT_USERNAME"
+
 volumes:
   pgdata:
     external: true