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

src/GmRelay.Web/GmRelay.Web.csproj

@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <ItemGroup>
+    <ProjectReference Include="..\GmRelay.Shared\GmRelay.Shared.csproj" />
+    <ProjectReference Include="..\GmRelay.ServiceDefaults\GmRelay.ServiceDefaults.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Aspire.Npgsql" Version="13.2.2" />
+    <PackageReference Include="Dapper" Version="2.1.72" />
+    <PackageReference Include="Npgsql" Version="10.0.2" />
+    <PackageReference Include="Telegram.Bot" Version="22.9.6.1" />
+  </ItemGroup>
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <BlazorDisableThrowNavigationException>true</BlazorDisableThrowNavigationException>
+  </PropertyGroup>
+
+</Project>