feat: add pagination controls to admin post list

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

models/paging.go

@@ -26,3 +26,12 @@ func (p PageInfo) PreviousPage() int {
 func (p PageInfo) NextPage() int {
 	return p.CurrentPage + 1
 }
+
+// Pages returns a slice of page numbers for rendering numbered pagination.
+func (p PageInfo) Pages() []int {
+	pages := make([]int, p.TotalPages)
+	for i := range pages {
+		pages[i] = i + 1
+	}
+	return pages
+}

views/posts/index.html

@@ -62,4 +62,22 @@
       {{ end }}
     </div>
   {{ end }}
+
+  {{ if gt .pageInfo.TotalPages 1 }}
+  <nav aria-label="Page navigation" class="my-4">
+    <ul class="pagination justify-content-center">
+      <li class="page-item{{ if not .pageInfo.HasPrevious }} disabled{{ end }}">
+        <a class="page-link" href="?page={{ .pageInfo.PreviousPage }}{{ if .req.Filter }}&filter={{ .req.Filter }}{{ end }}">Previous</a>
+      </li>
+      {{ range $p := .pageInfo.Pages }}
+      <li class="page-item{{ if eq $p $.pageInfo.CurrentPage }} active{{ end }}">
+        <a class="page-link" href="?page={{ $p }}{{ if $.req.Filter }}&filter={{ $.req.Filter }}{{ end }}">{{ $p }}</a>
+      </li>
+      {{ end }}
+      <li class="page-item{{ if not .pageInfo.HasNext }} disabled{{ end }}">
+        <a class="page-link" href="?page={{ .pageInfo.NextPage }}{{ if .req.Filter }}&filter={{ .req.Filter }}{{ end }}">Next</a>
+      </li>
+    </ul>
+  </nav>
+  {{ end }}
 </main>