feat(admin): standalone Projects page + per-project asset manager

- content-svc: GET /v1/projects (browse/search all projects across containers,
  paginated, admin) returning template name/slug + AE status; project_assets
  table (mig 23) + entity; GET/POST/DELETE /v1/projects/{id}/assets
- /admin/projects: searchable, paginated list of every renderable project with
  thumbnail, template, aspect/resolution, AE-file + publish status
- ProjectAssets component: list/upload/delete named footage/image/audio/font
  files per project (reused in the projects page; AE file upload alongside)
- nav + fa/en "Projects" label

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

services/content/FlatRender.ContentSvc/Controllers/TemplatesController.cs

@@ -57,10 +57,35 @@ public record SetSortRequest(int Sort);
 [Route("v1/projects")]
 public class ProjectsController(TemplateService svc) : ControllerBase
 {
+    // Browse/search all projects across templates (admin).
+    [Authorize(Roles = "Admin")]
+    [HttpGet]
+    public async Task<IActionResult> List([FromQuery] string? q, [FromQuery] Guid? containerId,
+        [FromQuery] int page = 1, [FromQuery] int pageSize = 30) =>
+        Ok(await svc.ListProjectsAsync(q, containerId, page, pageSize));
+
     [HttpGet("{id:guid}")]
     public async Task<IActionResult> GetProject(Guid id) =>
         Ok(await svc.GetProjectDetailAsync(id));
 
+    // ── Per-project assets (footage / images / audio / fonts) ──────────────────
+    [HttpGet("{id:guid}/assets")]
+    public async Task<IActionResult> ListAssets(Guid id) =>
+        Ok(await svc.ListAssetsAsync(id));
+
+    [Authorize(Roles = "Admin")]
+    [HttpPost("{id:guid}/assets")]
+    public async Task<IActionResult> AddAsset(Guid id, [FromBody] CreateAssetRequest req) =>
+        Ok(await svc.AddAssetAsync(id, req));
+
+    [Authorize(Roles = "Admin")]
+    [HttpDelete("{id:guid}/assets/{assetId:guid}")]
+    public async Task<IActionResult> DeleteAsset(Guid id, Guid assetId)
+    {
+        await svc.DeleteAssetAsync(assetId);
+        return NoContent();
+    }
+
     [Authorize(Roles = "Admin")]
     [HttpPost]
     public async Task<IActionResult> CreateProject([FromBody] CreateProjectRequest req) =>