chore(initial-implementation): remove RCL boilerplate, close phase 1 tracking

Per Phase 1 reviewer notes — strips Component1.razor, ExampleJsInterop, and
the wwwroot template assets generated by 'dotnet new razorclasslib'. Phase 5
will populate Marathon.UI from scratch with the real layout, components, and
wwwroot/index.html for BlazorWebView. Build still green (0/0).

plans/initial-implementation/PLAN.md

@@ -63,7 +63,7 @@ parameter configurable.
 | Phase | Domain | Status | Review | Build | Committed |
 |---|---|---|---|---|---|
 | Phase 0: Scraping spike | backend | ✅ Done | ⚠️ Pass with notes (Sonnet) | ⏭️ N/A (research) | ✅ 070e34b |
-| Phase 1: Solution + Domain | backend | ✅ Done | ⬜ | ✅ Build OK | ⬜ |
+| Phase 1: Solution + Domain | backend | ✅ Done | ⚠️ Pass with notes (Sonnet) | ✅ Build OK + 96/96 Domain tests | ✅ 61114ea |
 | Phase 2: Storage | backend | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |
 | Phase 3: Scraping | backend | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |
 | Phase 4: Application + Workers | backend | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |

src/Marathon.UI/Component1.razor

@@ -1,3 +0,0 @@
-<div class="my-component">
-    This component is defined in the <strong>Marathon.UI</strong> library.
-</div>

src/Marathon.UI/Component1.razor.css

@@ -1,6 +0,0 @@
-.my-component {
-    border: 2px dashed red;
-    padding: 1em;
-    margin: 1em 0;
-    background-image: url('background.png');
-}

src/Marathon.UI/ExampleJsInterop.cs

@@ -1,36 +0,0 @@
-using Microsoft.JSInterop;
-
-namespace Marathon.UI;
-
-// This class provides an example of how JavaScript functionality can be wrapped
-// in a .NET class for easy consumption. The associated JavaScript module is
-// loaded on demand when first needed.
-//
-// This class can be registered as scoped DI service and then injected into Blazor
-// components for use.
-
-public class ExampleJsInterop : IAsyncDisposable
-{
-    private readonly Lazy<Task<IJSObjectReference>> moduleTask;
-
-    public ExampleJsInterop(IJSRuntime jsRuntime)
-    {
-        moduleTask = new (() => jsRuntime.InvokeAsync<IJSObjectReference>(
-            "import", "./_content/Marathon.UI/exampleJsInterop.js").AsTask());
-    }
-
-    public async ValueTask<string> Prompt(string message)
-    {
-        var module = await moduleTask.Value;
-        return await module.InvokeAsync<string>("showPrompt", message);
-    }
-
-    public async ValueTask DisposeAsync()
-    {
-        if (moduleTask.IsValueCreated)
-        {
-            var module = await moduleTask.Value;
-            await module.DisposeAsync();
-        }
-    }
-}

src/Marathon.UI/wwwroot/exampleJsInterop.js

@@ -1,6 +0,0 @@
-// This is a JavaScript module that is loaded on demand. It can export any number of
-// functions, and may import other JavaScript modules if required.
-
-export function showPrompt(message) {
-  return prompt(message, 'Type anything here');
-}