style: Compact search/filter forms across all pages

- Reduce card-body padding to p-2
- Change gap from g-3 to g-2
- Convert row columns to col-auto for compact layout
- Add form-control-sm and form-select-sm
- Shorten placeholder text and labels
- Applied to: Blog, Clients, Inquiries

Result: Search sections now take minimal vertical space,
table data dominates the view for better data density.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

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

@@ -5,15 +5,15 @@
 <section class="admin-page-shell">
     @await Html.PartialAsync("_AdminPageHeader", new TaxBaik.Web.Models.AdminPageHeaderModel("Customer Requests", "문의 관리", "상담 요청을 상태별로 확인합니다.", "/admin/inquiries/create", "문의 등록"))
     <div class="card">
-        <div class="card-body">
+        <div class="card-body p-2">
             <form method="get">
-                <div class="row g-3 align-items-end">
-                    <div class="col-md-4">
-                        <label class="form-label" for="Status">상태</label>
-                        <input class="form-control" id="Status" name="status" value="@Model.Status" placeholder="new / consulting / contracted ..." />
+                <div class="row g-2 align-items-end">
+                    <div class="col-md-3">
+                        <label class="form-label form-label-sm" for="Status">상태</label>
+                        <input class="form-control form-control-sm" id="Status" name="status" value="@Model.Status" placeholder="new, consulting..." />
                     </div>
-                    <div class="col-md-2 d-grid">
-                        <button class="btn btn-primary" type="submit">필터</button>
+                    <div class="col-auto">
+                        <button class="btn btn-primary btn-sm" type="submit">필터</button>
                     </div>
                 </div>
             </form>