feat(admin): category SEO fields, Templates admin, safe project PATCH

- categories/tags admin forms: add meta title/description/keywords, bot-follow,
  sort, is_active (backend already supported these)
- new Templates admin (/admin/templates): container CRUD with description,
  keywords, publishing, premium, primary mode, category/tag assignment, plus
  editable per-variant aspect & resolution
- content-svc: PATCH /v1/projects/{id} partial update so aspect/resolution edits
  never wipe render/colour data (SharedColorsSvg, RenderAepComp, Folder)
- admin resource proxy: add PATCH passthrough

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

services/content/FlatRender.ContentSvc/Models/Requests/Requests.cs

@@ -215,6 +215,24 @@ public record UpdateProjectRequest(
     int Sort
 );
 
+// Partial update — only non-null fields are applied, so editing an aspect/resolution
+// never wipes render/colour data that the full UpdateProjectRequest would require.
+public record PatchProjectRequest(
+    string? Name,
+    string? Description,
+    string? Aspect,
+    string? Resolution,
+    string? ChooseMode,
+    int? OriginalWidth,
+    int? OriginalHeight,
+    decimal? ProjectDurationSec,
+    decimal? MinDurationSec,
+    decimal? MaxDurationSec,
+    int? FreeFps,
+    bool? IsPublished,
+    int? Sort
+);
+
 // ── CMS ──────────────────────────────────────────────────────────────────────
 
 public record CreateBlogRequest(