feat: WBS-CRM-01 고객 카드 (Client Card) Phase 1 구현

DB:
- V006__CreateClients.sql: clients 테이블 (name, company_name, phone,
  email, service_type, tax_type, status, source, memo)

Domain:
- Client 엔티티
- IClientRepository (GetPagedAsync 이름/연락처/회사명 검색 + 상태 필터)

Infrastructure:
- ClientRepository: ILIKE 검색, 페이징, CRUD

Application:
- ClientService: ServiceTypes/TaxTypes/Sources 상수 정의
- CreateClientDto

Admin UI:
- ClientList.razor: 검색바 + 상태 필터 + 페이징 테이블
- ClientEdit.razor: 기본정보/세무정보/관리정보 섹션 폼
- MainLayout: 고객 관리 NavGroup 추가, 홈페이지 메뉴 그룹화

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

TaxBaik.Infrastructure/DependencyInjection.cs

@@ -16,6 +16,7 @@ public static class DependencyInjection
         services.AddScoped<IInquiryRepository, InquiryRepository>();
         services.AddScoped<ISiteSettingRepository, SiteSettingRepository>();
         services.AddScoped<IAnnouncementRepository, AnnouncementRepository>();
+        services.AddScoped<IClientRepository, ClientRepository>();
 
         return services;
     }

TaxBaik.Infrastructure/Repositories/ClientRepository.cs

@@ -0,0 +1,70 @@
+namespace TaxBaik.Infrastructure.Repositories;
+
+using Dapper;
+using TaxBaik.Domain.Entities;
+using TaxBaik.Domain.Interfaces;
+
+public class ClientRepository(IDbConnectionFactory connectionFactory) : BaseRepository(connectionFactory), IClientRepository
+{
+    private const string SelectColumns =
+        "id, name, company_name, phone, email, service_type, tax_type, status, source, memo, created_at, updated_at";
+
+    public async Task<(IEnumerable<Client> Items, int Total)> GetPagedAsync(
+        int page, int pageSize, string? status = null, string? search = null, CancellationToken ct = default)
+    {
+        using var conn = Conn();
+        var offset = (page - 1) * pageSize;
+
+        using var reader = await conn.QueryMultipleAsync(
+            $@"SELECT {SelectColumns} FROM clients
+               WHERE (@Status::text IS NULL OR status = @Status)
+                 AND (@Search::text IS NULL OR name ILIKE @SearchLike OR phone ILIKE @SearchLike OR company_name ILIKE @SearchLike)
+               ORDER BY created_at DESC
+               LIMIT @PageSize OFFSET @Offset;
+
+               SELECT COUNT(*) FROM clients
+               WHERE (@Status::text IS NULL OR status = @Status)
+                 AND (@Search::text IS NULL OR name ILIKE @SearchLike OR phone ILIKE @SearchLike OR company_name ILIKE @SearchLike);",
+            new { Status = status, Search = search, SearchLike = string.IsNullOrEmpty(search) ? null : $"%{search}%", PageSize = pageSize, Offset = offset });
+
+        var items = (await reader.ReadAsync<Client>()).ToList();
+        var total = await reader.ReadFirstAsync<int>();
+        return (items, total);
+    }
+
+    public async Task<Client?> GetByIdAsync(int id, CancellationToken ct = default)
+    {
+        using var conn = Conn();
+        return await conn.QueryFirstOrDefaultAsync<Client>(
+            $"SELECT {SelectColumns} FROM clients WHERE id = @Id",
+            new { Id = id });
+    }
+
+    public async Task<int> CreateAsync(Client client, CancellationToken ct = default)
+    {
+        using var conn = Conn();
+        return await conn.QueryFirstAsync<int>(
+            @"INSERT INTO clients (name, company_name, phone, email, service_type, tax_type, status, source, memo, created_at, updated_at)
+              VALUES (@Name, @CompanyName, @Phone, @Email, @ServiceType, @TaxType, @Status, @Source, @Memo, NOW(), NOW())
+              RETURNING id",
+            client);
+    }
+
+    public async Task UpdateAsync(Client client, CancellationToken ct = default)
+    {
+        using var conn = Conn();
+        await conn.ExecuteAsync(
+            @"UPDATE clients
+              SET name = @Name, company_name = @CompanyName, phone = @Phone, email = @Email,
+                  service_type = @ServiceType, tax_type = @TaxType, status = @Status,
+                  source = @Source, memo = @Memo, updated_at = NOW()
+              WHERE id = @Id",
+            client);
+    }
+
+    public async Task DeleteAsync(int id, CancellationToken ct = default)
+    {
+        using var conn = Conn();
+        await conn.ExecuteAsync("DELETE FROM clients WHERE id = @Id", new { Id = id });
+    }
+}