chore: add structured feature request template

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,23 @@
+name: "💡 Feature Request"
+description: Suggest an idea or architectural improvement for Distributed Task Engine
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: "Problem or Need"
+      description: "Is your feature request related to a problem? Please describe."
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: "Proposed Solution"
+      description: "A clear description of what you want to happen."
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: "Alternatives Considered"
+      description: "Any alternative solutions or features you've considered."