Upgrade EF Core packages to 9.0.14 and fix remaining FluentAssertions rename

EF Core 8→9 must be done as a single coordinated bump: Microsoft.EntityFrameworkCore,
Microsoft.EntityFrameworkCore.Sqlite, and Microsoft.EntityFrameworkCore.Design all need
to be at the same major version. The three separate Dependabot PRs (#494, #495, #496)
each caused version conflicts or runtime failures when applied individually.

Also fixes the remaining BeLessOrEqualTo → BeLessThanOrEqualTo rename missed in PR #504
(midRangePayload variable in OpsCliApiTests.cs had a different prefix so replace_all
didn't catch it).

Author: Chris0Jeky

backend/src/Taskdeck.Infrastructure/Taskdeck.Infrastructure.csproj

@@ -18,9 +18,9 @@
   <ItemGroup>
     <PackageReference Include="BCrypt.Net-Next" Version="4.1.0" />
     <PackageReference Include="Microsoft.AspNetCore.Http" Version="2.3.9" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.25" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.25" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.25">
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.14" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.14" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="9.0.14">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>

backend/tests/Taskdeck.Api.Tests/OpsCliApiTests.cs

@@ -155,7 +155,7 @@ public async Task RunCommand_ShouldFallbackCorrelationId_WhenRequestCorrelationH
             var midRangePayload = await midRangeResponse.Content.ReadFromJsonAsync<CommandRunDto>();
             midRangePayload.Should().NotBeNull();
             midRangePayload!.CorrelationId.Should().NotBe(midRangeInvalidCorrelationId);
-            midRangePayload.CorrelationId.Length.Should().BeLessOrEqualTo(100);
+            midRangePayload.CorrelationId.Length.Should().BeLessThanOrEqualTo(100);
 
             midRangeResponse.Headers.TryGetValues("X-Request-Id", out var midRangeResponseRequestIds).Should().BeTrue();
             midRangeResponseRequestIds!.Single().Should().Be(midRangePayload.CorrelationId);