feat: cross-aspect project duplication + AEP convention/rule-engine spec

- content-svc: DuplicateProjectAsync clones full scene/element/colour graph
  (identical keys, new dimensions/aspect; AEP intentionally not copied;
  starts unpublished) + POST /v1/projects/{id}/duplicate.
- admin: «تکثیر» button + modal on each project row; aspects reduced to
  supported 16:9/1:1/9:16; free fps default 21 (clamped 1-60).
- docs/aep-template-convention.md: versioned (v1/v2) convention + rule-engine
  spec — modes, scene types, flatrender assembly, duration/fade model,
  fit-box, input types, expression-driven data flow, output spec.

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

.claude/launch.json

@@ -0,0 +1,18 @@
+{
+  "version": "0.0.1",
+  "configurations": [
+    {
+      "name": "web",
+      "runtimeExecutable": "npm",
+      "runtimeArgs": ["run", "dev"],
+      "port": 3000
+    },
+    {
+      "name": "hokm-dev",
+      "runtimeExecutable": "cmd",
+      "runtimeArgs": ["/c", "cd /d D:\\Projects\\hokm && npm run dev"],
+      "port": 3020,
+      "autoPort": true
+    }
+  ]
+}