Move projects to src; add Neutrino secret

src/API/Controllers/Config/V1/ConfigController.cs

@@ -0,0 +1,17 @@
+using Microsoft.AspNetCore.Mvc;
+using RecNet.Application.Common.Interfaces;
+
+namespace API.Controllers.Config.V1;
+
+[Route("api/[controller]/v1")]
+[ApiController]
+public class ConfigController(IConfigService configService) : ControllerBase
+{
+    [HttpGet("motd")]
+    public async Task<ActionResult<string>> GetMotd(CancellationToken ct = default)
+    {
+        var motd = await configService.GetAsync("Config:MOTD", "Ten Whole Years!", ct);
+
+        return Ok(motd);
+    }
+}