Implement admin CRUD for announcements inquiries and faqs

src/TaxBaik.Web/Pages/Admin/Faqs/Create.cshtml

@@ -0,0 +1,47 @@
+@page
+@model TaxBaik.Web.Pages.Admin.Faqs.CreateModel
+@{ ViewData["Title"] = "FAQ 작성"; }
+
+<section class="admin-page-shell">
+    <partial name="_AdminPageHeader" model='("Support", "FAQ 작성", "Tabler 표준 폼으로 FAQ를 등록합니다.", null, null)' />
+
+    <form method="post" class="card">
+        <div class="card-body">
+            <partial name="_ValidationSummary" />
+            <div class="row g-3">
+                <div class="col-lg-8">
+                    <label asp-for="Input.Question" class="form-label"></label>
+                    <input asp-for="Input.Question" class="form-control" />
+                </div>
+                <div class="col-lg-4">
+                    <label asp-for="Input.Category" class="form-label"></label>
+                    <input asp-for="Input.Category" class="form-control" list="faq-categories" />
+                    <datalist id="faq-categories">
+                        @foreach (var category in Model.Categories)
+                        {
+                            <option value="@category"></option>
+                        }
+                    </datalist>
+                </div>
+                <div class="col-12">
+                    <label asp-for="Input.Answer" class="form-label"></label>
+                    <textarea asp-for="Input.Answer" class="form-control" rows="10"></textarea>
+                </div>
+                <div class="col-md-4">
+                    <label asp-for="Input.SortOrder" class="form-label"></label>
+                    <input asp-for="Input.SortOrder" class="form-control" type="number" />
+                </div>
+                <div class="col-12">
+                    <label class="form-check">
+                        <input asp-for="Input.IsActive" class="form-check-input" type="checkbox" />
+                        <span class="form-check-label">활성</span>
+                    </label>
+                </div>
+            </div>
+        </div>
+        <div class="card-footer d-flex justify-content-end gap-2">
+            <a class="btn btn-outline-secondary" href="/admin/faqs">취소</a>
+            <button class="btn btn-primary" type="submit">저장</button>
+        </div>
+    </form>
+</section>

src/TaxBaik.Web/Pages/Admin/Faqs/Create.cshtml.cs

@@ -0,0 +1,32 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using TaxBaik.Domain.Entities;
+using TaxBaik.Application.Services;
+using TaxBaik.Web.Services;
+
+namespace TaxBaik.Web.Pages.Admin.Faqs;
+
+[Authorize(AuthenticationSchemes = AdminAuthDefaults.Scheme)]
+public class CreateModel(FaqService faqService) : PageModel
+{
+    [BindProperty]
+    public Faq Input { get; set; } = new();
+
+    public IReadOnlyList<string> Categories => FaqService.Categories;
+
+    public IActionResult OnGet()
+    {
+        Input.IsActive = true;
+        return Page();
+    }
+
+    public async Task<IActionResult> OnPostAsync(CancellationToken ct)
+    {
+        if (!ModelState.IsValid)
+            return Page();
+
+        await faqService.CreateAsync(Input, ct);
+        return RedirectToPage("/Admin/Faqs/Index");
+    }
+}

src/TaxBaik.Web/Pages/Admin/Faqs/Detail.cshtml

@@ -0,0 +1,43 @@
+@page "{id:int}"
+@model TaxBaik.Web.Pages.Admin.Faqs.DetailModel
+@{ ViewData["Title"] = "FAQ 상세"; }
+
+<section class="admin-page-shell">
+    <partial name="_AdminPageHeader" model='("Support", "FAQ 상세", "FAQ의 질문, 답변, 상태를 확인합니다.", null, null)' />
+
+    @if (Model.Item is null)
+    {
+        <partial name="_EmptyState" model="FAQ를 찾을 수 없습니다." />
+    }
+    else
+    {
+        <div class="row g-4">
+            <div class="col-lg-8">
+                <div class="card">
+                    <div class="card-body">
+                        <dl class="row details-grid mb-0">
+                            <dt class="col-sm-3">질문</dt>
+                            <dd class="col-sm-9">@Model.Item.Question</dd>
+                            <dt class="col-sm-3">답변</dt>
+                            <dd class="col-sm-9"><div class="pre-wrap">@Model.Item.Answer</div></dd>
+                            <dt class="col-sm-3">카테고리</dt>
+                            <dd class="col-sm-9">@Model.Item.Category</dd>
+                            <dt class="col-sm-3">활성</dt>
+                            <dd class="col-sm-9"><partial name="_StatusBadge" model="@(Model.Item.IsActive ? "active" : "inactive")" /></dd>
+                            <dt class="col-sm-3">정렬</dt>
+                            <dd class="col-sm-9">@Model.Item.SortOrder</dd>
+                        </dl>
+                    </div>
+                </div>
+            </div>
+            <div class="col-lg-4">
+                <div class="card">
+                    <div class="card-body d-grid gap-2">
+                        <a class="btn btn-primary" href="/admin/faqs/@Model.Item.Id/edit">수정</a>
+                        <a class="btn btn-outline-secondary" href="/admin/faqs">목록</a>
+                    </div>
+                </div>
+            </div>
+        </div>
+    }
+</section>

src/TaxBaik.Web/Pages/Admin/Faqs/Detail.cshtml.cs

@@ -0,0 +1,20 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using TaxBaik.Application.Services;
+using TaxBaik.Domain.Entities;
+using TaxBaik.Web.Services;
+
+namespace TaxBaik.Web.Pages.Admin.Faqs;
+
+[Authorize(AuthenticationSchemes = AdminAuthDefaults.Scheme)]
+public class DetailModel(FaqService faqService) : PageModel
+{
+    public Faq? Item { get; private set; }
+
+    public async Task<IActionResult> OnGetAsync(int id, CancellationToken ct)
+    {
+        Item = await faqService.GetByIdAsync(id, ct);
+        return Page();
+    }
+}

src/TaxBaik.Web/Pages/Admin/Faqs/Edit.cshtml

@@ -0,0 +1,51 @@
+@page "{id:int}"
+@model TaxBaik.Web.Pages.Admin.Faqs.EditModel
+@{ ViewData["Title"] = "FAQ 수정"; }
+
+<section class="admin-page-shell">
+    <partial name="_AdminPageHeader" model='("Support", "FAQ 수정", "기존 FAQ를 Tabler 표준 폼으로 수정합니다.", null, null)' />
+
+    <form method="post" class="card">
+        <div class="card-body">
+            <partial name="_ValidationSummary" />
+            <input type="hidden" asp-for="Input.Id" />
+            <div class="row g-3">
+                <div class="col-lg-8">
+                    <label asp-for="Input.Question" class="form-label"></label>
+                    <input asp-for="Input.Question" class="form-control" />
+                </div>
+                <div class="col-lg-4">
+                    <label asp-for="Input.Category" class="form-label"></label>
+                    <input asp-for="Input.Category" class="form-control" list="faq-categories" />
+                    <datalist id="faq-categories">
+                        @foreach (var category in Model.Categories)
+                        {
+                            <option value="@category"></option>
+                        }
+                    </datalist>
+                </div>
+                <div class="col-12">
+                    <label asp-for="Input.Answer" class="form-label"></label>
+                    <textarea asp-for="Input.Answer" class="form-control" rows="10"></textarea>
+                </div>
+                <div class="col-md-4">
+                    <label asp-for="Input.SortOrder" class="form-label"></label>
+                    <input asp-for="Input.SortOrder" class="form-control" type="number" />
+                </div>
+                <div class="col-12">
+                    <label class="form-check">
+                        <input asp-for="Input.IsActive" class="form-check-input" type="checkbox" />
+                        <span class="form-check-label">활성</span>
+                    </label>
+                </div>
+            </div>
+        </div>
+        <div class="card-footer d-flex justify-content-between gap-2">
+            <button class="btn btn-outline-danger" type="submit" formaction="?handler=Delete" formmethod="post" onclick="return confirm('정말 삭제하시겠습니까?');">삭제</button>
+            <div class="d-flex gap-2">
+                <a class="btn btn-outline-secondary" href="/admin/faqs">취소</a>
+                <button class="btn btn-primary" type="submit">저장</button>
+            </div>
+        </div>
+    </form>
+</section>

src/TaxBaik.Web/Pages/Admin/Faqs/Edit.cshtml.cs

@@ -0,0 +1,54 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using TaxBaik.Domain.Entities;
+using TaxBaik.Application.Services;
+using TaxBaik.Web.Services;
+
+namespace TaxBaik.Web.Pages.Admin.Faqs;
+
+[Authorize(AuthenticationSchemes = AdminAuthDefaults.Scheme)]
+public class EditModel(FaqService faqService) : PageModel
+{
+    [BindProperty(SupportsGet = true)]
+    public int Id { get; set; }
+
+    [BindProperty]
+    public Faq Input { get; set; } = new();
+
+    public IReadOnlyList<string> Categories => FaqService.Categories;
+
+    public async Task<IActionResult> OnGetAsync(CancellationToken ct)
+    {
+        var faq = await faqService.GetByIdAsync(Id, ct);
+        if (faq is null)
+            return NotFound();
+
+        Input = new Faq
+        {
+            Id = faq.Id,
+            Question = faq.Question,
+            Answer = faq.Answer,
+            Category = faq.Category,
+            SortOrder = faq.SortOrder,
+            IsActive = faq.IsActive
+        };
+
+        return Page();
+    }
+
+    public async Task<IActionResult> OnPostAsync(CancellationToken ct)
+    {
+        if (!ModelState.IsValid)
+            return Page();
+
+        await faqService.UpdateAsync(Input, ct);
+        return RedirectToPage("/Admin/Faqs/Index");
+    }
+
+    public async Task<IActionResult> OnPostDeleteAsync(CancellationToken ct)
+    {
+        await faqService.DeleteAsync(Id, ct);
+        return RedirectToPage("/Admin/Faqs/Index");
+    }
+}

src/TaxBaik.Web/Pages/Admin/Faqs/Index.cshtml

@@ -3,17 +3,17 @@
 @{ ViewData["Title"] = "FAQ"; }
 
 <section class="admin-page-shell">
-    <partial name="_AdminPageHeader" model='("Support", "FAQ 관리", "질문과 답변을 관리합니다.", null, null)' />
+    <partial name="_AdminPageHeader" model='("Support", "FAQ 관리", "질문과 답변을 관리합니다.", "/admin/faqs/create", "새 FAQ 작성")' />
     <div class="card">
         <div class="table-responsive">
-            <table class="table table-vcenter card-table">
+            <table class="table table-vcenter card-table table-hover">
                 <thead>
-                    <tr><th>질문</th><th>카테고리</th><th>활성</th><th>정렬</th></tr>
+                    <tr><th>질문</th><th>카테고리</th><th>활성</th><th>정렬</th><th class="text-end">작업</th></tr>
                 </thead>
                 <tbody>
                 @if (Model.Items.Count == 0)
                 {
-                    <tr><td colspan="4"><partial name="_EmptyState" model="FAQ가 없습니다." /></td></tr>
+                    <tr><td colspan="5"><partial name="_EmptyState" model="FAQ가 없습니다." /></td></tr>
                 }
                 else
                 {
@@ -24,6 +24,12 @@
                             <td>@item.Category</td>
                             <td><partial name="_StatusBadge" model="@(item.IsActive ? "active" : "inactive")" /></td>
                             <td>@item.SortOrder</td>
+                            <td class="text-end">
+                                <div class="btn-list flex-nowrap justify-content-end">
+                                    <a class="btn btn-sm btn-outline-secondary" href="/admin/faqs/@item.Id">상세</a>
+                                    <a class="btn btn-sm btn-primary" href="/admin/faqs/@item.Id/edit">수정</a>
+                                </div>
+                            </td>
                         </tr>
                     }
                 }