refactor: move buildable .NET source into src/, update CI/doc paths

Groups the repo root into src (buildable source), docs (already existed),
and everything else (db/, scripts/, tests/, deploy/ - deployment/ops/test
assets that aren't compiled, already organized as their own folders). CI
now only needs src/ to build: dotnet restore/build/test/publish all point
at src/TaxBaik.sln, src/TaxBaik.Web/, src/TaxBaik.Proxy/.

- git mv every project (Domain, Infrastructure, Application,
  Application.Tests, Web, Web.Client, Proxy) and TaxBaik.sln into src/ as a
  unit, so relative ProjectReference/.sln paths stay valid unchanged.
- .gitea/workflows/deploy.yml: 6 dotnet restore/clean/build/test/publish
  invocations now point at src/. db/migrations and scripts/ stay at root
  (deploy_gb.sh and browser-e2e.yml only touch published output and the
  deployed URL, not source paths - verified, no changes needed there).
- scripts/validate_admin_render.sh: admin render-mode file paths now
  src/TaxBaik.Web.Client/...
- scripts/validate_kst_timestamps.sh: dropped deploy.sh from its target
  list - that script was removed in the prior cleanup commit (dead, no
  CI workflow referenced it) but this validator still expected it to exist.
- CLAUDE.md, docs/ENGINEERING_HARNESS.md, docs/ADMIN_PATTERN_CRITIQUE_WBS.md:
  updated project-structure diagram, dotnet run/build commands, and grep
  targets to the new src/ paths (also fixed a pre-existing stale path in
  ADMIN_PATTERN_CRITIQUE_WBS.md that still said TaxBaik.Web/Components/Admin
  from before that ever moved to TaxBaik.Web.Client).
- Added a Repo Root harness rule + Architecture Guardrail entries: new files
  belong under src/docs/tests/scripts/db/deploy, not loose at root; temp
  work stays outside the repo (or under a gitignored .scratch/) and is
  never committed.

Verified locally: dotnet build/test src/TaxBaik.sln (26/26 tests), and all
three scripts/validate_*.sh pass against the new layout.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/TaxBaik.Web.Client/Components/Admin/Pages/Blog/BlogEdit.razor

@@ -0,0 +1,155 @@
+@page "/admin/blog/{id:int}/edit"
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
+@attribute [Authorize]
+@using TaxBaik.Application.DTOs
+@using TaxBaik.WasmClient.Components.Admin.Pages.Blog
+@inject IBlogBrowserClient BlogClient
+@inject ICategoryBrowserClient CategoryClient
+@inject NavigationManager Navigation
+@inject ISnackbar Snackbar
+@inject IDialogService DialogService
+
+<PageTitle>포스트 수정</PageTitle>
+
+<AdminCrudPageShell Title="포스트 수정"
+                    Eyebrow="Content"
+                    Subtitle="블로그 포스트를 수정합니다."
+                    Loading="@isLoading"
+                    SkeletonContent="@EditorSkeleton"
+                    OnCancel="@GoBack">
+    @if (post == null)
+{
+    <MudAlert Severity="Severity.Error" Class="mt-4">포스트를 찾을 수 없습니다.</MudAlert>
+}
+else
+{
+    <MudPaper Class="pa-4 mt-4" Elevation="1">
+        <BlogForm Model="model" Categories="categories" SubmitText="저장" OnSubmit="SavePost" />
+        <div class="mt-4">
+            <MudButton Variant="Variant.Outlined" Color="Color.Error" @onclick="DeletePost">삭제</MudButton>
+        </div>
+    </MudPaper>
+}
+</AdminCrudPageShell>
+
+@code {
+    [Parameter]
+    public int Id { get; set; }
+
+    private TaxBaik.Application.DTOs.BlogPostResponseDto? post;
+    private IReadOnlyList<Domain.Entities.Category> categories = [];
+    private BlogForm.BlogFormModel model = new();
+    private bool isLoading = true;
+
+    private RenderFragment EditorSkeleton => builder =>
+    {
+        builder.OpenComponent<AdminSkeletonRows>(0);
+        builder.AddAttribute(1, "Rows", 5);
+        builder.AddAttribute(2, "Columns", 3);
+        builder.CloseComponent();
+    };
+
+    protected override async Task OnInitializedAsync()
+    {
+        try
+        {
+            post = await BlogClient.GetByIdAsync(Id);
+            if (post != null)
+            {
+                categories = await CategoryClient.GetAllAsync();
+                MapPostToModel(post);
+            }
+        }
+        catch (Exception ex)
+        {
+            Snackbar.Add($"포스트 로드 실패: {ex.Message}", Severity.Error);
+        }
+        finally
+        {
+            isLoading = false;
+        }
+    }
+
+    private void MapPostToModel(TaxBaik.Application.DTOs.BlogPostResponseDto post)
+    {
+        model.Title = post.Title;
+        model.Content = post.Content;
+        model.CategoryId = post.CategoryId;
+        model.Tags = post.Tags;
+        model.SeoTitle = post.SeoTitle;
+        model.SeoDescription = post.SeoDescription;
+        model.IsPublished = post.IsPublished;
+    }
+
+    private void GoBack()
+    {
+        Navigation.NavigateTo("/taxbaik/admin/blog");
+    }
+
+    private async Task SavePost()
+    {
+        if (post == null)
+            return;
+
+        try
+        {
+            var result = await BlogClient.UpdateAsync(post.Id, new CreateBlogPostDto
+            {
+                Title = model.Title,
+                Content = model.Content,
+                CategoryId = model.CategoryId,
+                Tags = model.Tags,
+                SeoTitle = model.SeoTitle,
+                SeoDescription = model.SeoDescription,
+                IsPublished = model.IsPublished
+            });
+
+            if (result == null)
+            {
+                Snackbar.Add("저장 실패: 포스트를 저장하지 못했습니다.", Severity.Error);
+                return;
+            }
+
+            Snackbar.Add("포스트가 저장되었습니다.", Severity.Success);
+            Navigation.NavigateTo("/taxbaik/admin/blog");
+        }
+        catch (ValidationException ex)
+        {
+            Snackbar.Add(ex.Message, Severity.Error);
+        }
+        catch (Exception ex)
+        {
+            Snackbar.Add($"저장 실패: {ex.Message}", Severity.Error);
+        }
+    }
+
+    private async Task DeletePost()
+    {
+        if (post == null)
+            return;
+
+        var result = await DialogService.ShowMessageBox(
+            "포스트 삭제",
+            "정말 삭제하시겠습니까? 이 작업은 취소할 수 없습니다.",
+            "삭제", "취소");
+
+        if (result != true)
+            return;
+
+        try
+        {
+            var deleted = await BlogClient.DeleteAsync(post.Id);
+            if (!deleted)
+            {
+                Snackbar.Add("삭제 실패: 포스트를 삭제하지 못했습니다.", Severity.Error);
+                return;
+            }
+            Snackbar.Add("포스트가 삭제되었습니다.", Severity.Success);
+            Navigation.NavigateTo("/taxbaik/admin/blog");
+        }
+        catch (Exception ex)
+        {
+            Snackbar.Add($"삭제 실패: {ex.Message}", Severity.Error);
+        }
+    }
+}