Move FeatureUsage code into MicCheck.Api.Features.Usage namespace

Groups usage-tracking (metrics, background flush, query service,
controller, entity) under its own namespace/folder, updates all
consumers and the EF migration snapshot's CLR type strings to match.

src/api/MicCheck.Api/Data/Configurations/FeatureUsageDailyConfiguration.cs

@@ -1,4 +1,4 @@
-using MicCheck.Api.Features;
+using MicCheck.Api.Features.Usage;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Metadata.Builders;
 

src/api/MicCheck.Api/Data/MicCheckDbContext.cs

@@ -2,6 +2,7 @@ using MicCheck.Api.Common.Security.ApiKeys;
 using MicCheck.Api.Audit;
 using MicCheck.Api.Common.Security.Authorization;
 using MicCheck.Api.Features;
+using MicCheck.Api.Features.Usage;
 using MicCheck.Api.Identities;
 using MicCheck.Api.Organizations;
 using MicCheck.Api.Projects;

src/api/MicCheck.Api/Features/FeatureEvaluationService.cs

@@ -1,4 +1,5 @@
 using MicCheck.Api.Data;
+using MicCheck.Api.Features.Usage;
 using MicCheck.Api.Identities;
 using MicCheck.Api.Segments;
 using Microsoft.EntityFrameworkCore;

src/api/MicCheck.Api/Features/Usage/FeatureUsageBucketKey.cs

@@ -1,3 +1,3 @@
-namespace MicCheck.Api.Features;
+namespace MicCheck.Api.Features.Usage;
 
 public record struct FeatureUsageBucketKey(int EnvironmentId, int FeatureId, string FeatureName, DateOnly UsageDate);

src/api/MicCheck.Api/Features/Usage/FeatureUsageController.cs

@@ -4,7 +4,7 @@ using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.RateLimiting;
 using Microsoft.Extensions.Caching.Memory;
 
-namespace MicCheck.Api.Features;
+namespace MicCheck.Api.Features.Usage;
 
 [ApiController]
 [Route("api/v1/environment/{environmentId}/usage")]

src/api/MicCheck.Api/Features/Usage/FeatureUsageDaily.cs

@@ -1,4 +1,4 @@
-namespace MicCheck.Api.Features;
+namespace MicCheck.Api.Features.Usage;
 
 public class FeatureUsageDaily
 {

src/api/MicCheck.Api/Features/Usage/FeatureUsageFlushBackgroundService.cs

@@ -2,7 +2,7 @@ using System.Diagnostics.CodeAnalysis;
 using MicCheck.Api.Data;
 using Microsoft.EntityFrameworkCore;
 
-namespace MicCheck.Api.Features;
+namespace MicCheck.Api.Features.Usage;
 
 [ExcludeFromCodeCoverage(Justification = "Timer-driven BackgroundService that issues raw SQL through a DI-scoped concrete MicCheckDbContext; exercising it cleanly requires a live DB, which CLAUDE.md disallows (no WebApplicationFactory/InMemory). DrainAccumulated's bucketing logic is covered by FeatureUsageMetricsTests.")]
 public class FeatureUsageFlushBackgroundService(

src/api/MicCheck.Api/Features/Usage/FeatureUsageMetrics.cs

@@ -1,7 +1,7 @@
 using System.Collections.Concurrent;
 using System.Diagnostics.Metrics;
 
-namespace MicCheck.Api.Features;
+namespace MicCheck.Api.Features.Usage;
 
 public class FeatureUsageMetrics : IDisposable
 {

src/api/MicCheck.Api/Features/Usage/FeatureUsageQueryService.cs

@@ -1,7 +1,7 @@
 using MicCheck.Api.Data;
 using Microsoft.EntityFrameworkCore;
 
-namespace MicCheck.Api.Features;
+namespace MicCheck.Api.Features.Usage;
 
 public class FeatureUsageQueryService(IMicCheckDbContext db)
 {

src/api/MicCheck.Api/Features/Usage/FeatureUsageResponses.cs

@@ -1,4 +1,4 @@
-namespace MicCheck.Api.Features;
+namespace MicCheck.Api.Features.Usage;
 
 public record TopFeatureUsage(int FeatureId, string FeatureName, long Count);
 

src/api/MicCheck.Api/Migrations/20260617194113_AddFeatureUsageDaily.Designer.cs

@@ -305,7 +305,7 @@ namespace MicCheck.Api.Migrations
                     b.ToTable("FeatureStates");
                 });
 
-            modelBuilder.Entity("MicCheck.Api.Features.FeatureUsageDaily", b =>
+            modelBuilder.Entity("MicCheck.Api.Features.Usage.FeatureUsageDaily", b =>
                 {
                     b.Property<int>("Id")
                         .ValueGeneratedOnAdd()

src/api/MicCheck.Api/Migrations/MicCheckDbContextModelSnapshot.cs

@@ -302,7 +302,7 @@ namespace MicCheck.Api.Migrations
                     b.ToTable("FeatureStates");
                 });
 
-            modelBuilder.Entity("MicCheck.Api.Features.FeatureUsageDaily", b =>
+            modelBuilder.Entity("MicCheck.Api.Features.Usage.FeatureUsageDaily", b =>
                 {
                     b.Property<int>("Id")
                         .ValueGeneratedOnAdd()

src/api/MicCheck.Api/Program.cs

@@ -8,6 +8,7 @@ using MicCheck.Api.Common.Validation;
 using MicCheck.Api.Data;
 using MicCheck.Api.Environments;
 using MicCheck.Api.Features;
+using MicCheck.Api.Features.Usage;
 using MicCheck.Api.Identities;
 using MicCheck.Api.Organizations;
 using MicCheck.Api.Projects;

tests/api/MicCheck.Api.Tests.Unit/Features/FeatureEvaluationServiceTests.cs

@@ -1,6 +1,7 @@
 using System.Diagnostics.Metrics;
 using MicCheck.Api.Data;
 using MicCheck.Api.Features;
+using MicCheck.Api.Features.Usage;
 using MicCheck.Api.Identities;
 using MicCheck.Api.Segments;
 using MicCheck.Api.Tests.Unit.TestSupport;

tests/api/MicCheck.Api.Tests.Unit/Features/FlagsApiIntegrationTests.cs

@@ -2,6 +2,7 @@ using System.Security.Claims;
 using MicCheck.Api.Data;
 using MicCheck.Api.Environments;
 using MicCheck.Api.Features;
+using MicCheck.Api.Features.Usage;
 using MicCheck.Api.Identities;
 using MicCheck.Api.Projects;
 using MicCheck.Api.Segments;

tests/api/MicCheck.Api.Tests.Unit/Features/Usage/FeatureUsageControllerTests.cs

@@ -1,12 +1,12 @@
 using MicCheck.Api.Data;
-using MicCheck.Api.Features;
+using MicCheck.Api.Features.Usage;
 using MicCheck.Api.Tests.Unit.TestSupport;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Caching.Memory;
 using Moq;
 using NUnit.Framework;
 
-namespace MicCheck.Api.Tests.Unit.Features;
+namespace MicCheck.Api.Tests.Unit.Features.Usage;
 
 [TestFixture]
 public class FeatureUsageControllerTests

tests/api/MicCheck.Api.Tests.Unit/Features/Usage/FeatureUsageMetricsTests.cs

@@ -1,9 +1,9 @@
 using System.Diagnostics.Metrics;
-using MicCheck.Api.Features;
+using MicCheck.Api.Features.Usage;
 using Moq;
 using NUnit.Framework;
 
-namespace MicCheck.Api.Tests.Unit.Features;
+namespace MicCheck.Api.Tests.Unit.Features.Usage;
 
 [TestFixture]
 public class FeatureUsageMetricsTests

tests/api/MicCheck.Api.Tests.Unit/Features/Usage/FeatureUsageQueryServiceTests.cs

@@ -1,10 +1,10 @@
 using MicCheck.Api.Data;
-using MicCheck.Api.Features;
+using MicCheck.Api.Features.Usage;
 using MicCheck.Api.Tests.Unit.TestSupport;
 using Moq;
 using NUnit.Framework;
 
-namespace MicCheck.Api.Tests.Unit.Features;
+namespace MicCheck.Api.Tests.Unit.Features.Usage;
 
 [TestFixture]
 public class FeatureUsageQueryServiceTests

tests/api/MicCheck.Api.Tests.Unit/Identities/IdentitiesControllerTests.cs

@@ -2,6 +2,7 @@ using System.Security.Claims;
 using MicCheck.Api.Data;
 using MicCheck.Api.Environments;
 using MicCheck.Api.Features;
+using MicCheck.Api.Features.Usage;
 using MicCheck.Api.Identities;
 using MicCheck.Api.Projects;
 using MicCheck.Api.Segments;