feat: 시즌별 마케팅 + 공지사항 관리 기능 추가

- 연간 세무 캘린더(7개 시즌) 기반 자동 Hero 섹션 전환
- 시즌 감지 시 D-Day 카운트다운, 긴박감 배지, 시즌 CTA 표시
- 서비스 카드 순서 시즌 관련 항목 우선 정렬
- 어드민 공지사항 CRUD (등록·수정·삭제, 기간·유형 설정)
- 홈페이지 상단 공지 배너 자동 노출 (일반/배너/긴급)
- CLAUDE.md에 세무 캘린더 및 마케팅 방향 하네스 추가

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

TaxBaik.Application/DTOs/AnnouncementDto.cs

@@ -0,0 +1,13 @@
+namespace TaxBaik.Application.DTOs;
+
+public class AnnouncementDto
+{
+    public int Id { get; set; }
+    public string Title { get; set; } = "";
+    public string? Content { get; set; }
+    public string DisplayType { get; set; } = "info";
+    public bool IsActive { get; set; } = true;
+    public DateTime? StartsAt { get; set; }
+    public DateTime? EndsAt { get; set; }
+    public int SortOrder { get; set; }
+}

TaxBaik.Application/DependencyInjection.cs

@@ -13,6 +13,8 @@ public static class DependencyInjection
         services.AddScoped<IInquiryNotificationService, NoopInquiryNotificationService>();
         services.AddScoped<SiteSettingService>();
         services.AddScoped<CategoryService>();
+        services.AddScoped<AnnouncementService>();
+        services.AddSingleton<SeasonalMarketingService>();
         return services;
     }
 }

TaxBaik.Application/Seasonal/CurrentSeasonDto.cs

@@ -0,0 +1,14 @@
+namespace TaxBaik.Application.Seasonal;
+
+public record CurrentSeasonDto
+{
+    public string Key { get; init; } = "";
+    public string Name { get; init; } = "";
+    public string HeroHeadline { get; init; } = "";
+    public string HeroSubtext { get; init; } = "";
+    public string UrgencyBadge { get; init; } = "";
+    public string FocusService { get; init; } = "";
+    public string CtaText { get; init; } = "상담 신청하기";
+    public int DaysUntilDeadline { get; init; }
+    public DateTime Deadline { get; init; }
+}

TaxBaik.Application/Seasonal/TaxSeason.cs

@@ -0,0 +1,18 @@
+namespace TaxBaik.Application.Seasonal;
+
+public record TaxSeason
+{
+    public string Key { get; init; } = "";
+    public string Name { get; init; } = "";
+
+    public int StartMonth { get; init; }
+    public int StartDay { get; init; }
+    public int EndMonth { get; init; }
+    public int EndDay { get; init; }
+
+    public string HeroHeadline { get; init; } = "";
+    public string HeroSubtext { get; init; } = "";
+    public string UrgencyBadge { get; init; } = "";
+    public string FocusService { get; init; } = "";
+    public string CtaText { get; init; } = "상담 신청하기";
+}

TaxBaik.Application/Seasonal/TaxSeasonCalendar.cs

@@ -0,0 +1,96 @@
+namespace TaxBaik.Application.Seasonal;
+
+/// <summary>
+/// 한국 세무사 사무실 연간 시즌 캘린더.
+/// 각 시즌이 활성화되면 홈페이지 Hero가 해당 세무 이벤트에 맞게 전환된다.
+/// </summary>
+public static class TaxSeasonCalendar
+{
+    public static readonly IReadOnlyList<TaxSeason> Seasons =
+    [
+        new TaxSeason
+        {
+            Key = "vat-2nd",
+            Name = "부가가치세 2기 확정신고",
+            StartMonth = 1, StartDay = 1,
+            EndMonth = 1, EndDay = 25,
+            HeroHeadline = "부가가치세 2기\n1월 25일 마감",
+            HeroSubtext = "일반과세 사업자 확정신고 · 기한 내 신고로 가산세 방지",
+            UrgencyBadge = "D-{n}일 | 부가세 마감",
+            FocusService = "business-tax",
+            CtaText = "부가세 신고 상담"
+        },
+        new TaxSeason
+        {
+            Key = "year-end-settlement",
+            Name = "연말정산",
+            StartMonth = 1, StartDay = 15,
+            EndMonth = 2, EndDay = 28,
+            HeroHeadline = "연말정산\n지금 준비하세요",
+            HeroSubtext = "직원이 있는 사업자 원천징수 신고 · 환급 최대화",
+            UrgencyBadge = "연말정산 진행 중",
+            FocusService = "business-tax",
+            CtaText = "연말정산 상담"
+        },
+        new TaxSeason
+        {
+            Key = "corporate-tax",
+            Name = "법인세 신고",
+            StartMonth = 3, StartDay = 1,
+            EndMonth = 3, EndDay = 31,
+            HeroHeadline = "법인세\n3월 31일 마감",
+            HeroSubtext = "법인사업자 결산 · 세무조정 · 절세 전략 수립",
+            UrgencyBadge = "D-{n}일 | 법인세 마감",
+            FocusService = "business-tax",
+            CtaText = "법인세 신고 상담"
+        },
+        new TaxSeason
+        {
+            Key = "income-tax",
+            Name = "종합소득세 신고",
+            StartMonth = 5, StartDay = 1,
+            EndMonth = 5, EndDay = 31,
+            HeroHeadline = "종합소득세\n5월 31일 마감",
+            HeroSubtext = "개인사업자 · 임대소득 · 프리랜서 · 기타소득 모두 해당",
+            UrgencyBadge = "D-{n}일 | 종합소득세 마감",
+            FocusService = "business-tax",
+            CtaText = "종합소득세 상담"
+        },
+        new TaxSeason
+        {
+            Key = "vat-1st",
+            Name = "부가가치세 1기 확정신고",
+            StartMonth = 7, StartDay = 1,
+            EndMonth = 7, EndDay = 25,
+            HeroHeadline = "부가가치세 1기\n7월 25일 마감",
+            HeroSubtext = "일반과세 사업자 1기 확정신고 · 매입세액 공제 점검",
+            UrgencyBadge = "D-{n}일 | 부가세 마감",
+            FocusService = "business-tax",
+            CtaText = "부가세 신고 상담"
+        },
+        new TaxSeason
+        {
+            Key = "comprehensive-real-estate-tax",
+            Name = "종합부동산세",
+            StartMonth = 11, StartDay = 15,
+            EndMonth = 11, EndDay = 30,
+            HeroHeadline = "종합부동산세\n납부 시즌",
+            HeroSubtext = "다주택자 · 임대사업자 세부담 분석 · 분납·합산배제 검토",
+            UrgencyBadge = "D-{n}일 | 종부세 납부",
+            FocusService = "real-estate-tax",
+            CtaText = "종부세 절세 상담"
+        },
+        new TaxSeason
+        {
+            Key = "year-end-gift",
+            Name = "연말 증여·절세 플래닝",
+            StartMonth = 12, StartDay = 1,
+            EndMonth = 12, EndDay = 31,
+            HeroHeadline = "연말 절세 플래닝\n마지막 기회",
+            HeroSubtext = "증여 공제 한도 · 자산 이전 · 법인전환 연간 마감",
+            UrgencyBadge = "D-{n}일 | 연간 증여 한도 마감",
+            FocusService = "family-asset",
+            CtaText = "연말 절세 상담"
+        }
+    ];
+}

TaxBaik.Application/Services/AnnouncementService.cs

@@ -0,0 +1,44 @@
+namespace TaxBaik.Application.Services;
+
+using TaxBaik.Application.DTOs;
+using TaxBaik.Domain.Entities;
+using TaxBaik.Domain.Interfaces;
+
+public class AnnouncementService(IAnnouncementRepository repository)
+{
+    public Task<IEnumerable<Announcement>> GetActiveAsync(CancellationToken ct = default)
+        => repository.GetActiveAsync(ct);
+
+    public Task<IEnumerable<Announcement>> GetAllAsync(CancellationToken ct = default)
+        => repository.GetAllAsync(ct);
+
+    public Task<Announcement?> GetByIdAsync(int id, CancellationToken ct = default)
+        => repository.GetByIdAsync(id, ct);
+
+    public Task<int> CreateAsync(AnnouncementDto dto, CancellationToken ct = default)
+    {
+        var entity = MapToEntity(dto);
+        return repository.CreateAsync(entity, ct);
+    }
+
+    public Task UpdateAsync(AnnouncementDto dto, CancellationToken ct = default)
+    {
+        var entity = MapToEntity(dto);
+        return repository.UpdateAsync(entity, ct);
+    }
+
+    public Task DeleteAsync(int id, CancellationToken ct = default)
+        => repository.DeleteAsync(id, ct);
+
+    private static Announcement MapToEntity(AnnouncementDto dto) => new()
+    {
+        Id = dto.Id,
+        Title = dto.Title.Trim(),
+        Content = string.IsNullOrWhiteSpace(dto.Content) ? null : dto.Content.Trim(),
+        DisplayType = dto.DisplayType,
+        IsActive = dto.IsActive,
+        StartsAt = dto.StartsAt,
+        EndsAt = dto.EndsAt,
+        SortOrder = dto.SortOrder
+    };
+}

TaxBaik.Application/Services/SeasonalMarketingService.cs

@@ -0,0 +1,38 @@
+namespace TaxBaik.Application.Services;
+
+using TaxBaik.Application.Seasonal;
+
+public class SeasonalMarketingService
+{
+    public CurrentSeasonDto? GetCurrentSeason()
+    {
+        var today = DateTime.Today;
+
+        foreach (var season in TaxSeasonCalendar.Seasons)
+        {
+            var start = new DateTime(today.Year, season.StartMonth, season.StartDay);
+            var end = new DateTime(today.Year, season.EndMonth, season.EndDay);
+
+            if (today >= start && today <= end)
+            {
+                var days = (end - today).Days;
+                return new CurrentSeasonDto
+                {
+                    Key = season.Key,
+                    Name = season.Name,
+                    HeroHeadline = season.HeroHeadline,
+                    HeroSubtext = season.HeroSubtext,
+                    UrgencyBadge = season.UrgencyBadge.Replace("{n}", days.ToString()),
+                    FocusService = season.FocusService,
+                    CtaText = season.CtaText,
+                    DaysUntilDeadline = days,
+                    Deadline = end
+                };
+            }
+        }
+
+        return null;
+    }
+
+    public IReadOnlyList<TaxSeason> GetFullCalendar() => TaxSeasonCalendar.Seasons;
+}