feat: wire up Program.cs, DI extensions, Serilog, and appsettings

- ServiceCollectionExtensions in DAL.EF: AddNotificationDataAccess (DbContext, UoW, repositories)
- ServiceCollectionExtensions in Services: AddNotificationServices (MediatR + TransactionBehavior)
- Api/Program.cs: Serilog, OpenAPI, controllers, DI wiring
- Worker/Program.cs: Serilog, DI wiring
- appsettings.json: Serilog config with Console + Seq sinks, connection string
- appsettings.Development.json: Debug log level overrides

Ref: IT-628

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

HrynCo.NotificationService.Worker/HrynCo.NotificationService.Worker.csproj

@@ -10,6 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Hosting" />
     <PackageReference Include="Serilog.Extensions.Hosting" />
+    <PackageReference Include="Serilog.Settings.Configuration" />
     <PackageReference Include="Serilog.Sinks.Console" />
     <PackageReference Include="Serilog.Sinks.Seq" />
   </ItemGroup>

HrynCo.NotificationService.Worker/Program.cs

@@ -1,7 +1,19 @@
+using HrynCo.NotificationService.DAL.EF;
+using HrynCo.NotificationService.Services;
 using HrynCo.NotificationService.Worker;
+using Serilog;
 
 var builder = Host.CreateApplicationBuilder(args);
+
+builder.Services.AddSerilog(lc =>
+    lc.ReadFrom.Configuration(builder.Configuration));
+
+string connectionString = builder.Configuration.GetConnectionString("Default")
+    ?? throw new InvalidOperationException("Connection string 'Default' is not configured.");
+
+builder.Services.AddNotificationDataAccess(connectionString);
+builder.Services.AddNotificationServices();
 builder.Services.AddHostedService<Worker>();
 
 var host = builder.Build();
-host.Run();
+host.Run();

HrynCo.NotificationService.Worker/appsettings.Development.json

@@ -1,8 +1,12 @@
 {
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft.Hosting.Lifetime": "Information"
+  "Serilog": {
+    "MinimumLevel": {
+      "Default": "Debug",
+      "Override": {
+        "Microsoft": "Information",
+        "Microsoft.EntityFrameworkCore": "Information",
+        "Microsoft.AspNetCore": "Information"
+      }
     }
   }
-}
+}

HrynCo.NotificationService.Worker/appsettings.json

@@ -1,8 +1,25 @@
 {
-  "Logging": {
-    "LogLevel": {
+  "ConnectionStrings": {
+    "Default": "Host=localhost;Port=5432;Database=notification_service;Username=postgres;Password=postgres"
+  },
+  "Serilog": {
+    "MinimumLevel": {
       "Default": "Information",
-      "Microsoft.Hosting.Lifetime": "Information"
-    }
+      "Override": {
+        "Microsoft": "Warning",
+        "Microsoft.EntityFrameworkCore": "Warning",
+        "Microsoft.AspNetCore": "Warning"
+      }
+    },
+    "WriteTo": [
+      { "Name": "Console" },
+      {
+        "Name": "Seq",
+        "Args": {
+          "serverUrl": "http://localhost:5341"
+        }
+      }
+    ],
+    "Enrich": [ "FromLogContext" ]
   }
-}
+}