feature: Observation Ingest, Synchronous Alert Detection, and Alert Lifecycle

VigilCareClinicalAPI.Tests/Fixtures/ApiFixture.cs

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+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Mvc.Testing;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using StackExchange.Redis;
+
+public class ApiFixture : WebApplicationFactory<Program>, IAsyncLifetime
+{
+    // Override configuration to point at a test database — never run tests against
+    // the development database; a botched rollback could corrupt seed data.
+    protected override void ConfigureWebHost(IWebHostBuilder builder)
+    {
+        builder.UseEnvironment("Testing");
+        builder.ConfigureAppConfiguration((_, config) =>
+        {
+            config.AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                ["ConnectionStrings:DefaultConnection"] =
+                    "Host=localhost;Port=5436;Database=vigilcare_test;Username=postgres;Password=password",
+                ["Redis:ConnectionString"] = "localhost:6382,defaultDatabase=1,allowAdmin=true"
+            });
+        });
+    }
+
+    public async Task InitializeAsync()
+    {
+        // Apply migrations against the test database on first run
+        using var scope = Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+        await db.Database.MigrateAsync();
+
+        // Flush the test Redis database (db=1) to avoid cross-test cache pollution
+        var redis = scope.ServiceProvider.GetRequiredService<IConnectionMultiplexer>();
+        var server = redis.GetServer(redis.GetEndPoints().First());
+        await server.FlushDatabaseAsync(1);
+    }
+
+    public new async Task DisposeAsync()
+    {
+        await base.DisposeAsync();
+    }
+}

VigilCareClinicalAPI.Tests/Fixtures/IntegrationTestCollection.cs

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+[CollectionDefinition("Integration")]
+public class IntegrationTestCollection : ICollectionFixture<ApiFixture>;