feat(admin): project (template-item) manager + After Effects file upload

The admin could edit a container but not manage its renderable projects or attach
AE files. Now, inside the template editor:
- add a new project/variant under the container (name, WxH, aspect, resolution,
  duration, fps, choose-mode) → POST /v1/projects (maps via container_id)
- upload the After Effects file (.aep/.zip) per project → new PATCH
  /v1/projects/{id}/aep (sets AepFileUrl/Minio/Md5/Size + RenderAepComp), with an
  "AE ✓ / بدون فایل" status badge
- set the render composition name; delete a variant
- ProjectResponse now surfaces aep_file_url / aep_file_size_bytes / render_aep_comp

Additive only — the existing aspect/resolution variant editing is unchanged.

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

services/content/FlatRender.ContentSvc/Application/Services/TemplateService.cs

@@ -310,9 +310,28 @@ public class TemplateService(ContentDbContext db)
         p.OriginalWidth, p.OriginalHeight, p.Aspect,
         p.ProjectDurationSec, p.MinDurationSec, p.MaxDurationSec,
         p.FreeFps, p.ChooseMode.ToString(), p.Resolution.ToString(),
-        p.IsPublished, p.Sort
+        p.IsPublished, p.Sort,
+        p.AepFileUrl, p.AepFileSizeBytes, p.RenderAepComp
     );
 
+    /// <summary>Attach an uploaded After Effects file (and render composition) to a project.</summary>
+    public async Task<ProjectDetailResponse> SetProjectAepAsync(Guid id, SetAepRequest req)
+    {
+        var project = await db.Projects.FirstOrDefaultAsync(p => p.Id == id && p.DeletedAt == null)
+            ?? throw new KeyNotFoundException($"Project {id} not found");
+        if (req.AepFileUrl != null) project.AepFileUrl = req.AepFileUrl;
+        if (req.AepMinioBucket != null) project.AepMinioBucket = req.AepMinioBucket;
+        if (req.AepMinioKey != null) project.AepMinioKey = req.AepMinioKey;
+        if (req.AepFileMd5 != null) project.AepFileMd5 = req.AepFileMd5;
+        if (req.AepFileSizeBytes.HasValue) project.AepFileSizeBytes = req.AepFileSizeBytes;
+        if (!string.IsNullOrWhiteSpace(req.RenderAepComp)) project.RenderAepComp = req.RenderAepComp;
+        if (req.Folder != null) project.Folder = req.Folder;
+        project.AepUploadedAt = DateTime.UtcNow;
+        project.UpdatedAt = DateTime.UtcNow;
+        await db.SaveChangesAsync();
+        return await GetProjectDetailAsync(id);
+    }
+
     private static ProjectDetailResponse MapProjectDetail(Project p) => new(
         p.Id, p.ContainerId, p.Name, p.Description, p.Image, p.FullDemo, p.DemoScriptTag, p.DownloadLink,
         p.OriginalWidth, p.OriginalHeight, p.Aspect,

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

@@ -77,6 +77,12 @@ public class ProjectsController(TemplateService svc) : ControllerBase
     public async Task<IActionResult> PatchProject(Guid id, [FromBody] PatchProjectRequest req) =>
         Ok(await svc.PatchProjectAsync(id, req));
 
+    // Attach an uploaded After Effects file (.aep) + render composition to a project.
+    [Authorize(Roles = "Admin")]
+    [HttpPatch("{id:guid}/aep")]
+    public async Task<IActionResult> SetAep(Guid id, [FromBody] SetAepRequest req) =>
+        Ok(await svc.SetProjectAepAsync(id, req));
+
     [Authorize(Roles = "Admin")]
     [HttpDelete("{id:guid}")]
     public async Task<IActionResult> DeleteProject(Guid id)

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

@@ -244,6 +244,16 @@ public record UpdateProjectRequest(
 
 // 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 SetAepRequest(
+    string? AepFileUrl,
+    string? AepMinioBucket,
+    string? AepMinioKey,
+    string? AepFileMd5,
+    long? AepFileSizeBytes,
+    string? RenderAepComp,
+    string? Folder
+);
+
 public record PatchProjectRequest(
     string? Name,
     string? Description,

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

@@ -128,7 +128,10 @@ public record ProjectResponse(
     string ChooseMode,
     string Resolution,
     bool IsPublished,
-    int Sort
+    int Sort,
+    string? AepFileUrl,
+    long? AepFileSizeBytes,
+    string RenderAepComp
 );
 
 public record ProjectDetailResponse(