feat: launch Vibeflow n8n v0.5.0

.github/DISCUSSION_TEMPLATE/ideas.yml

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+title: Ideas
+labels: [ideas]
+body:
+  - type: textarea
+    id: summary
+    attributes:
+      label: Idea summary
+      description: What would you like to see in Vibeflow n8n?
+    validations:
+      required: true
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What problem would this solve?
+  - type: textarea
+    id: sketch
+    attributes:
+      label: Proposed approach
+      description: Share a rough implementation idea or usage example.

.github/DISCUSSION_TEMPLATE/show-and-tell.yml

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+title: Show and tell
+labels: [show-and-tell]
+body:
+  - type: textarea
+    id: built
+    attributes:
+      label: What did you build?
+      description: Share the workflow, recipe, or automation you created with Vibeflow n8n.
+    validations:
+      required: true
+  - type: textarea
+    id: notes
+    attributes:
+      label: Notes
+      description: What worked well, what was tricky, and what should improve?