chore(github): overhaul issue and PR templates

Bug, feature, and question templates now collect the triage signal the
maintainers usually have to ask for (install method, OS, area, reverse
proxy, logs, version). config.yml disables blank issues and points to
Wiki / existing issues / latest release from the picker.

PR template adds Summary/Why/Type/Areas/Testing/Breaking-changes
sections and a fuller checklist (build, tests, lint, typecheck, docs).
Renamed pull_request_template.yml -> .md to match GitHub's conventional
extension; the old .yml was being read as markdown anyway.

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -1,39 +1,102 @@
-name: Feature request
-description: Suggest an idea for this project
-title: "Feature request"
-labels: ["enhancement"]
-
-body:
-  - type: textarea
-    id: is-related-problem
-    attributes:
-      label: Is your feature request related to a problem?
-      description: A clear and concise description of what the problem is.
-      placeholder: I'm always frustrated when...
-    validations:
-      required: true
-
-  - type: textarea
-    id: solution
-    attributes:
-      label: Describe the solution you'd like
-      description: A clear and concise description of what you want to happen.
-    validations:
-      required: true
-
-  - type: textarea
-    id: alternatives
-    attributes:
-      label: Describe alternatives you've considered
-      description: A clear and concise description of any alternative solutions or features you've considered.
-    validations:
-      required: false
-
-  - type: checkboxes
-    id: checklist
-    attributes:
-      label: Checklist
-      description: Please check all the checkboxes
-      options:
-        - label: This feature report is written entirely in English.
-          required: true
+name: Feature request
+description: Suggest an idea or improvement for 3x-ui
+title: "[Feature]: "
+labels: ["enhancement", "needs triage"]
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to suggest a feature. Please **search
+        [existing issues](../issues?q=is%3Aissue)** first — duplicates will be closed.
+
+  - type: textarea
+    id: is-related-problem
+    attributes:
+      label: Is your feature request related to a problem?
+      description: A clear and concise description of the problem you're hitting today.
+      placeholder: I'm always frustrated when …
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the solution you'd like
+      description: |
+        What should the panel do? Be specific — UI placement, API shape,
+        config keys, expected behavior under edge cases.
+      placeholder: |
+        On the Inbounds page, add a button that …
+        The backend should expose a new endpoint at …
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives you've considered
+      description: Other ways you tried to solve this, and why they fell short.
+    validations:
+      required: false
+
+  - type: textarea
+    id: use-case
+    attributes:
+      label: Concrete use case
+      description: |
+        Walk us through a real scenario where this feature would help.
+        Numbers help (e.g. "I manage 200 clients across 5 inbounds and …").
+    validations:
+      required: false
+
+  - type: textarea
+    id: mockup
+    attributes:
+      label: Mockups, screenshots, or examples
+      description: |
+        Drag images, paste config snippets, or link to similar features in
+        other tools. Helps us understand the shape of the request.
+    validations:
+      required: false
+
+  - type: dropdown
+    id: area
+    attributes:
+      label: Which parts of the panel would this affect?
+      multiple: true
+      options:
+        - Frontend (UI / panel pages)
+        - Backend (API endpoints, login, settings)
+        - Xray config generation
+        - Subscription (share links / Clash / JSON)
+        - Statistics / traffic counters
+        - Database / migrations
+        - Install / upgrade script
+        - Docker image
+        - Multi-node (sub-nodes)
+        - Telegram bot
+        - Other
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: contribution
+    attributes:
+      label: Are you willing to help?
+      description: Optional — but maintainers prioritize requests with community help.
+      options:
+        - label: I'd like to implement this feature myself and open a PR.
+          required: false
+        - label: I can help test once a PR is open.
+          required: false
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Before submitting
+      options:
+        - label: I searched [existing issues](../issues?q=is%3Aissue) and this feature has not been requested.
+          required: true
+        - label: This feature request is written in English.
+          required: true