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/Shared/AdminShell.razor

@@ -0,0 +1,141 @@
+@inject NavigationManager Navigation
+@inject IJSRuntime JS
+@implements IDisposable
+
+<MudPopoverProvider />
+<MudDialogProvider />
+<MudSnackbarProvider />
+
+<MudLayout Class="admin-shell">
+    <MudAppBar Elevation="0" Class="admin-topbar">
+        <MudIconButton Icon="@Icons.Material.Filled.Menu"
+                       Color="Color.Inherit"
+                       Edge="Edge.Start"
+                       Class="admin-menu-button"
+                       OnClick="@ToggleDrawer" />
+        <div class="admin-topbar-title">
+            <MudText Typo="Typo.body2" Class="font-weight-bold admin-brand-text">TaxBaik</MudText>
+            <MudText Typo="Typo.body2" Class="admin-brand-subtitle">세무회계 관리 대시보드</MudText>
+        </div>
+        <MudSpacer />
+
+        <div class="admin-topbar-actions">
+            <MudButton Class="admin-topbar-action"
+                       Variant="Variant.Text"
+                       Color="Color.Inherit"
+                       Size="Size.Small"
+                       StartIcon="@Icons.Material.Filled.OpenInNew"
+                       Href="/taxbaik"
+                       Target="_blank">
+                공개 사이트
+            </MudButton>
+
+            <MudDivider Vertical="true" FlexItem="true" Class="mx-2" />
+
+            <MudButton Class="admin-topbar-action"
+                       Variant="Variant.Text"
+                       Color="Color.Error"
+                       Size="Size.Small"
+                       StartIcon="@Icons.Material.Filled.Logout"
+                       Href="/taxbaik/admin/logout">
+                로그아웃
+            </MudButton>
+        </div>
+    </MudAppBar>
+
+    <MudDrawer @bind-open="@drawerOpen"
+               Elevation="0"
+               Variant="DrawerVariant.Responsive"
+               Breakpoint="Breakpoint.Md"
+               Class="admin-drawer">
+        <div class="admin-drawer-brand">
+            <div class="admin-brand-mark">T</div>
+            <div>
+                <MudText Typo="Typo.subtitle1">TaxBaik</MudText>
+                <MudText Typo="Typo.caption">세무 운영 콘솔</MudText>
+            </div>
+        </div>
+        <MudNavMenu Class="admin-nav">
+            <MudNavLink Href="/taxbaik/admin/dashboard" Match="NavLinkMatch.All" Icon="@Icons.Material.Filled.Dashboard" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/dashboard"))">대시보드</MudNavLink>
+            <MudNavGroup Title="CRM & 세무관리" Icon="@Icons.Material.Filled.BusinessCenter" @bind-Expanded="@expandedCRMGroup">
+                <MudNavLink Href="/taxbaik/admin/tax-profiles" Icon="@Icons.Material.Filled.Assignment" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/tax-profiles"))">세무 프로필</MudNavLink>
+                <MudNavLink Href="/taxbaik/admin/tax-filing-schedules" Icon="@Icons.Material.Filled.CalendarMonth" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/tax-filing-schedules"))">신고 일정</MudNavLink>
+                <MudNavLink Href="/taxbaik/admin/contracts" Icon="@Icons.Material.Filled.Description" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/contracts"))">계약 관리</MudNavLink>
+                <MudNavLink Href="/taxbaik/admin/consulting-activities" Icon="@Icons.Material.Filled.ChatBubble" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/consulting-activities"))">상담 활동</MudNavLink>
+                <MudNavLink Href="/taxbaik/admin/revenue-trackings" Icon="@Icons.Material.Filled.Receipt" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/revenue-trackings"))">수익 추적</MudNavLink>
+            </MudNavGroup>
+            <MudNavGroup Title="고객 관리" Icon="@Icons.Material.Filled.PeopleAlt" @bind-Expanded="@expandedCustomerGroup">
+                <MudNavLink Href="/taxbaik/admin/clients" Icon="@Icons.Material.Filled.ContactPage" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/clients"))">고객 카드</MudNavLink>
+                <MudNavLink Href="/taxbaik/admin/tax-filings" Icon="@Icons.Material.Filled.Assessment" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/tax-filings"))">세무신고</MudNavLink>
+            </MudNavGroup>
+            <MudNavGroup Title="홈페이지" Icon="@Icons.Material.Filled.Home" @bind-Expanded="@expandedWebsiteGroup">
+                <MudNavLink Href="/taxbaik/admin/announcements" Icon="@Icons.Material.Filled.Campaign" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/announcements"))">공지사항</MudNavLink>
+                <MudNavLink Href="/taxbaik/admin/faqs" Icon="@Icons.Material.Filled.QuestionAnswer" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/faqs"))">FAQ 관리</MudNavLink>
+                <MudNavLink Href="/taxbaik/admin/blog" Icon="@Icons.Material.Filled.Article" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/blog"))">블로그 관리</MudNavLink>
+                <MudNavLink Href="/taxbaik/admin/season-simulator" Icon="@Icons.Material.Filled.Preview" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/season-simulator"))">시즌 시뮬레이터</MudNavLink>
+            </MudNavGroup>
+            <MudNavLink Href="/taxbaik/admin/inquiries" Icon="@Icons.Material.Filled.Forum" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/inquiries"))">문의 관리</MudNavLink>
+            <MudNavLink Href="/taxbaik/admin/settings" Icon="@Icons.Material.Filled.Tune" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/settings"))">설정</MudNavLink>
+            <MudNavLink Href="/taxbaik/admin/common-codes" Icon="@Icons.Material.Filled.Category" ClickPreventDefault="true" OnClick="@(() => NavigateTo("/taxbaik/admin/common-codes"))">공통관리</MudNavLink>
+        </MudNavMenu>
+        <div class="admin-drawer-version">
+            <div class="admin-drawer-version-label">Version</div>
+            <div class="admin-drawer-version-value">vunknown</div>
+            <div class="admin-drawer-version-built">unknown</div>
+        </div>
+    </MudDrawer>
+
+    <MudMainContent Class="admin-main">
+        <MudContainer MaxWidth="MaxWidth.False" Class="admin-content">
+            @ChildContent
+        </MudContainer>
+    </MudMainContent>
+</MudLayout>
+
+@code {
+    [Parameter]
+    public RenderFragment? ChildContent { get; set; }
+
+    private bool drawerOpen = true;
+    private bool expandedCRMGroup = true;
+    private bool expandedCustomerGroup = false;
+    private bool expandedWebsiteGroup = false;
+
+    protected override void OnInitialized()
+    {
+        Navigation.LocationChanged += OnLocationChanged;
+    }
+
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (firstRender)
+        {
+            await JS.InvokeVoidAsync("taxbaikAdminSession.setContext", "admin/shell", "navigation", "layout", "shell", "shell", "", "main");
+            await JS.InvokeVoidAsync("taxbaikAdminSession.hideLoading");
+        }
+    }
+
+    private void OnLocationChanged(object? sender, LocationChangedEventArgs args)
+    {
+        var route = new Uri(args.Location).AbsolutePath;
+        _ = JS.InvokeVoidAsync("taxbaikAdminSession.setContext", route, "navigation", "route-change", "layout", "shell", "", route);
+        _ = InvokeAsync(() => JS.InvokeVoidAsync("taxbaikAdminSession.hideLoading"));
+    }
+
+    private void ToggleDrawer()
+    {
+        drawerOpen = !drawerOpen;
+        _ = JS.InvokeVoidAsync("taxbaikAdminSession.setContext", "admin/shell", "navigation", "drawer", drawerOpen ? "opened" : "closed", "shell", "", "drawer");
+        _ = JS.InvokeVoidAsync("taxbaikAdminSession.traceUiState", "admin-shell", drawerOpen ? "drawer opened" : "drawer closed");
+    }
+
+    private void NavigateTo(string url)
+    {
+        Navigation.NavigateTo(url);
+    }
+
+    public void Dispose()
+    {
+        Navigation.LocationChanged -= OnLocationChanged;
+    }
+}