fix(blog): repair pagination on public and admin interfaces

Public /blog: the handler param was named `page`, which is a reserved
route token in Razor Pages and never binds — so every page silently
showed the same first 10 posts. Renamed the query param to `pg`
([FromQuery(Name="pg")]) and updated the pagination links to match.

Admin: the posts table had no pagination and dumped all rows at once.
Added client-side pagination (10/page) with a prev/next + numbered bar
over the already-loaded posts array.

Verified: public page1=10/page2=4 with zero overlap; admin shows
‹ 1 2 › with correct row counts and active state per page.

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

DrSousan.Api/Pages/Blog/Index.cshtml

@@ -101,16 +101,16 @@
     <div class="pagination">
       @if (Model.CurrentPage > 1)
       {
-          <a class="page-btn" href="/blog?page=@(Model.CurrentPage - 1)@(!string.IsNullOrEmpty(Model.ActiveCat) ? "&category=" + Model.ActiveCat : "")">‹</a>
+          <a class="page-btn" href="/blog?pg=@(Model.CurrentPage - 1)@(!string.IsNullOrEmpty(Model.ActiveCat) ? "&category=" + Model.ActiveCat : "")">‹</a>
       }
       @for (int p = 1; p <= Model.TotalPages; p++)
       {
           <a class="page-btn @(p == Model.CurrentPage ? "active" : "")"
-             href="/blog?page=@p@(!string.IsNullOrEmpty(Model.ActiveCat) ? "&category=" + Model.ActiveCat : "")">@p</a>
+             href="/blog?pg=@p@(!string.IsNullOrEmpty(Model.ActiveCat) ? "&category=" + Model.ActiveCat : "")">@p</a>
       }
       @if (Model.CurrentPage < Model.TotalPages)
       {
-          <a class="page-btn" href="/blog?page=@(Model.CurrentPage + 1)@(!string.IsNullOrEmpty(Model.ActiveCat) ? "&category=" + Model.ActiveCat : "")">›</a>
+          <a class="page-btn" href="/blog?pg=@(Model.CurrentPage + 1)@(!string.IsNullOrEmpty(Model.ActiveCat) ? "&category=" + Model.ActiveCat : "")">›</a>
       }
     </div>
 }