feat(gallery+editor): dedicated /gallery page, homepage teaser, in-content images

Homepage gallery:
- Show only 3 before/after samples as a teaser (was: all items)
- Add "مشاهده گالری کامل (N نمونه)" CTA when more than 3 exist
- Remove the now-pointless category tabs from the teaser

New /gallery page:
- Full before/after grid with category filter tabs (deduped from data)
- Responsive cards with قبل/بعد labels + captions, empty state
- Added to sitemap.xml (priority 0.8)

Blog content editor:
- New 🖼 تصویر toolbar button inserts an uploaded image at the cursor
  (direct upload, no forced crop) — for richer post bodies
- Responsive img styling on the public post page

Note: the filler-lab-soorat cover not showing is a data issue — that
post has an empty featuredImage in the DB (verified); re-upload + save
fixes it. The upload/save path itself is correct.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

DrSousan.Api/Pages/Gallery.cshtml

@@ -0,0 +1,105 @@
+@page "/gallery"
+@model DrSousan.Api.Pages.GalleryModel
+
+@section Head {
+    <title>@ViewData["Title"]</title>
+    <meta name="description" content="گالری نتایج واقعی قبل و بعد درمان‌های زیبایی پوست دکتر سوسن آل‌طه — بوتاکس، فیلر، لیزر، مزوتراپی و پاکسازی پوست." />
+    <link rel="canonical" href="@((Environment.GetEnvironmentVariable("SITE_BASE_URL")?.TrimEnd('/') ?? (Request.Scheme + "://" + Request.Host)) + "/gallery")" />
+    <style>
+      .gal-hero{background:linear-gradient(135deg,var(--gold-pale) 0%,#EDE0CA 100%);padding:6rem 2rem 3rem;text-align:center}
+      .gal-hero h1{font-size:clamp(1.8rem,4vw,2.5rem);font-weight:700;color:var(--dark);margin-bottom:.6rem}
+      .gal-hero p{font-size:1rem;color:var(--mid);max-width:560px;margin:0 auto}
+      .gal-tabs{display:flex;gap:.6rem;justify-content:center;flex-wrap:wrap;max-width:1100px;margin:2rem auto 0;padding:0 2rem}
+      .gal-tab{background:transparent;border:1.5px solid var(--border);color:var(--mid);padding:.45rem 1.2rem;border-radius:50px;font-family:'Vazirmatn',sans-serif;font-size:.85rem;cursor:pointer;transition:all .2s}
+      .gal-tab.active,.gal-tab:hover{background:var(--gold);border-color:var(--gold);color:#fff}
+      .gal-grid{max-width:1100px;margin:2.5rem auto;padding:0 2rem;display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
+      @@media(max-width:900px){.gal-grid{grid-template-columns:repeat(2,1fr)}}
+      @@media(max-width:600px){.gal-grid{grid-template-columns:repeat(2,1fr);gap:.8rem}}
+      @@media(max-width:380px){.gal-grid{grid-template-columns:1fr}}
+      .gal-item{border-radius:16px;overflow:hidden;background:var(--white);border:1px solid var(--border);display:flex;flex-direction:column}
+      .gal-imgwrap{aspect-ratio:4/3;position:relative;overflow:hidden;background:linear-gradient(135deg,var(--gold-pale),#EDE0CA)}
+      .gal-imgwrap img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .4s}
+      .gal-item:hover .gal-imgwrap img{transform:scale(1.05)}
+      .gal-ba{display:flex;flex-direction:row;height:100%}
+      .gal-ba .half{flex:1;position:relative;overflow:hidden}
+      .gal-ba .divider{width:2px;background:var(--border);flex-shrink:0}
+      .gal-labels{display:flex}
+      .gal-labels span{flex:1;text-align:center;padding:6px 8px;font-size:.78rem;font-weight:600;color:var(--mid);border-top:1px solid var(--border)}
+      .gal-labels span:first-child{border-left:1px solid var(--border)}
+      .gal-caption{padding:.55rem .8rem;font-size:.8rem;color:var(--mid);text-align:center;border-top:1px solid var(--border);line-height:1.5}
+      .gal-empty{text-align:center;padding:4rem 2rem;color:var(--light)}
+      .gal-back{text-align:center;padding:1rem 2rem 4rem}
+    </style>
+}
+
+<div class="gal-hero">
+  <h1>گالری نتایج قبل و بعد</h1>
+  <p>نمونه‌ای از نتایج واقعی درمان‌های انجام‌شده توسط دکتر سوسن آل‌طه. روی هر تصویر، قبل و بعد درمان قابل مشاهده است.</p>
+</div>
+
+@if (Model.Categories.Any())
+{
+    <div class="gal-tabs">
+      <button class="gal-tab active" data-filter="">همه</button>
+      @foreach (var cat in Model.Categories)
+      {
+          <button class="gal-tab" data-filter="@cat">@cat</button>
+      }
+    </div>
+}
+
+<div class="gal-grid" id="galGrid">
+  @if (!Model.Items.Any())
+  {
+      <div class="gal-empty" style="grid-column:1/-1"><p>هنوز نمونه‌ای ثبت نشده است.</p></div>
+  }
+  else
+  {
+      @foreach (var item in Model.Items)
+      {
+          var hasBoth = !string.IsNullOrEmpty(item.BeforeImageUrl) && !string.IsNullOrEmpty(item.AfterImageUrl);
+          var hasImg  = !string.IsNullOrEmpty(item.ImageUrl);
+          <div class="gal-item" data-cat="@item.Category">
+            <div class="gal-imgwrap">
+              @if (hasBoth)
+              {
+                  <div class="gal-ba">
+                    <div class="half"><img src="@item.BeforeImageUrl" alt="قبل از درمان @item.Caption" loading="lazy"/></div>
+                    <div class="divider"></div>
+                    <div class="half"><img src="@item.AfterImageUrl" alt="بعد از درمان @item.Caption" loading="lazy"/></div>
+                  </div>
+              }
+              else if (hasImg)
+              {
+                  <img src="@item.ImageUrl" alt="@item.Caption" loading="lazy"/>
+              }
+            </div>
+            @if (hasBoth)
+            {
+                <div class="gal-labels"><span>قبل از درمان</span><span>بعد از درمان</span></div>
+            }
+            @if (!string.IsNullOrEmpty(item.Caption)) { <div class="gal-caption">@item.Caption</div> }
+          </div>
+      }
+  }
+</div>
+
+<div class="gal-back">
+  <a href="/#contact" class="btn-primary">رزرو نوبت و مشاوره</a>
+</div>
+
+@section Scripts {
+<script>
+  document.querySelectorAll('.gal-tab').forEach(btn => {
+    btn.addEventListener('click', () => {
+      document.querySelectorAll('.gal-tab').forEach(b => b.classList.remove('active'));
+      btn.classList.add('active');
+      const f = btn.dataset.filter || '';
+      document.querySelectorAll('#galGrid .gal-item').forEach(item => {
+        const match = f === '' || (item.dataset.cat || '') === f;
+        item.style.display = match ? '' : 'none';
+      });
+    });
+  });
+</script>
+}