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>

TaxBaik.Application/Services/AdminDashboardService.cs

@@ -1,87 +0,0 @@
-namespace TaxBaik.Application.Services;
-
-using Microsoft.Extensions.Caching.Memory;
-using TaxBaik.Domain.Entities;
-
-public record AdminDashboardSummary(
-    int ThisMonthInquiries,
-    int NewInquiries,
-    int TotalPosts,
-    int PublishedPosts,
-    IReadOnlyList<Inquiry> RecentInquiries);
-
-public class AdminDashboardService(
-    InquiryService inquiryService,
-    BlogService blogService,
-    IMemoryCache memoryCache)
-{
-    private static readonly TimeSpan CacheDuration = TimeSpan.FromSeconds(30);
-    public const string CacheKey = "admin-dashboard-summary";
-
-    public async Task<AdminDashboardSummary> GetSummaryAsync(CancellationToken ct = default)
-    {
-        if (memoryCache.TryGetValue(CacheKey, out AdminDashboardSummary? cached) && cached != null)
-            return cached;
-
-        var recentTask = inquiryService.GetPagedAsync(1, 5, ct: ct);
-        var thisMonthTask = inquiryService.CountThisMonthAsync(ct);
-        var newTask = inquiryService.CountByStatusAsync("new", ct);
-        var statsTask = blogService.GetStatsAsync(ct);
-
-        var (recentInquiries, _) = await recentTask;
-        var stats = await statsTask;
-        var summary = new AdminDashboardSummary(
-            ThisMonthInquiries: await thisMonthTask,
-            NewInquiries: await newTask,
-            TotalPosts: stats.TotalPosts,
-            PublishedPosts: stats.PublishedPosts,
-            RecentInquiries: recentInquiries.OrderByDescending(x => x.CreatedAt).Take(5).ToList());
-
-        memoryCache.Set(CacheKey, summary, CacheDuration);
-        return summary;
-    }
-
-    /// <summary>
-    /// 최근 문의 조회
-    /// </summary>
-    public async Task<IReadOnlyList<Inquiry>> GetRecentInquiriesAsync(int limit, CancellationToken ct = default)
-    {
-        var (inquiries, _) = await inquiryService.GetPagedAsync(1, limit, ct: ct);
-        return inquiries.OrderByDescending(x => x.CreatedAt).ToList();
-    }
-
-    /// <summary>
-    /// 월별 통계 (접수 건수, 진행 중, 완료)
-    /// </summary>
-    public async Task<object> GetMonthlyStatsAsync(string? month, CancellationToken ct = default)
-    {
-        var targetMonth = month != null && DateTime.TryParse($"{month}-01", out var dt)
-            ? dt
-            : DateTime.Today;
-
-        var startDate = new DateTime(targetMonth.Year, targetMonth.Month, 1);
-        var endDate = startDate.AddMonths(1).AddDays(-1);
-
-        // 캐시 시도 (일 단위)
-        var cacheKey = $"admin-stats-{startDate:yyyy-MM}";
-        if (memoryCache.TryGetValue(cacheKey, out object? cachedStats) && cachedStats != null)
-            return cachedStats;
-
-        var total = await inquiryService.CountByDateRangeAsync(startDate, endDate, ct);
-        var consulting = await inquiryService.CountByStatusAndDateAsync("consulting", startDate, endDate, ct);
-        var completed = await inquiryService.CountByStatusAndDateAsync("contracted", startDate, endDate, ct);
-
-        var result = new
-        {
-            month = startDate.ToString("yyyy-MM"),
-            totalInquiries = total,
-            consultingCount = consulting,
-            completedCount = completed,
-            newCount = total - consulting - completed,
-            completionRate = total > 0 ? (completed * 100.0 / total) : 0.0
-        };
-
-        memoryCache.Set(cacheKey, result, TimeSpan.FromHours(1));
-        return result;
-    }
-}