chore: rework issue and discussion templates around scope policy

Issue forms: trim prerequisite checkboxes to the two that matter, make the
yt-dlp test field explicitly conditional (UI bugs write "UI bug"), lead the
feature form with the scope line and the already-decided list, and retire
the question template in favor of Discussions Q&A.

Discussion forms: rename q-and-a.yml to q-a.yml so it matches the actual
category slug (it never applied), add ideas.yml for the category where
feature requests actually land, drop configuration-help.yml (no matching
category) and the inert config.yml (blank_discussions_enabled is not a
GitHub feature), and remove checkboxes from low-stakes discussion forms.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -5,28 +5,35 @@ labels: ["enhancement"]
 assignees: []
 
 body:
+  - type: markdown
+    attributes:
+      value: |
+        ## Read this first — MeTube's scope
+
+        MeTube's scope is deliberately narrow: **it downloads well and stops once the file is written.**
+        Features that improve the download itself are welcome — usually as community PRs, since the
+        maintainer is unlikely to implement requests ([details](https://github.com/alexta69/metube#-submitting-feature-requests)).
+        Post-download file management is out of scope regardless of implementation quality.
+
+        **Already decided — please don't re-request:**
+        - 🔒 Built-in authentication / password → use a reverse proxy ([#931](https://github.com/alexta69/metube/issues/931), [wiki](https://github.com/alexta69/metube/wiki/Reverse-proxy-configurations))
+        - 🔔 Notifications on download completion → available today via the `Exec` postprocessor ([recipe](https://github.com/alexta69/metube/wiki/YTDL_OPTIONS-Cookbook))
+        - ✏️ Renaming, converting, tagging, or organizing files after download → out of scope ([#495](https://github.com/alexta69/metube/issues/495), [#1027](https://github.com/alexta69/metube/issues/1027))
+        - 🎚️ Pre-download format/quality/audio-track picker → tracked in [#1032](https://github.com/alexta69/metube/issues/1032)
+        - 📋 Pre-download playlist item browser → tracked in [#1030](https://github.com/alexta69/metube/issues/1030)
+        - 🎛️ Config switches to disable individual features → declined ([#976](https://github.com/alexta69/metube/issues/976))
+        - ⏰ Download scheduler → declined; add items with auto-start off and start them when you like ([#838](https://github.com/alexta69/metube/issues/838))
+
   - type: checkboxes
     id: prerequisites
     attributes:
       label: Prerequisites
-      description: Please confirm you have completed these steps before submitting your feature request
+      description: Please confirm before submitting
       options:
-        - label: I have searched existing issues and discussions to ensure this feature hasn't been requested before
+        - label: I have searched existing issues and checked the "Already decided" list above
           required: true
-        - label: I have read the [feature request guidelines](https://github.com/alexta69/metube#-submitting-feature-requests) in the README
+        - label: I have considered if this feature belongs in yt-dlp instead (downloading, processing, site support) — if so, please request it in the [yt-dlp repository](https://github.com/yt-dlp/yt-dlp/issues)
           required: true
-        - label: I understand that MeTube development relies on community contributions and the maintainer is not likely to implement this feature
-          required: true
-        - label: I have considered if this feature should be implemented in yt-dlp instead of MeTube (if so, please report to [yt-dlp repository](https://github.com/yt-dlp/yt-dlp/issues))
-          required: true
-
-  - type: markdown
-    attributes:
-      value: |
-        ## Important Notes
-        - **MeTube development relies on code contributions by the community** - the project is feature-complete for the maintainer's use cases
-        - **Consider if this belongs in yt-dlp** - if it's related to video downloading, processing, or site support, it might belong in the [yt-dlp repository](https://github.com/yt-dlp/yt-dlp/issues) instead
-        - **Some features may not be accepted** - in an effort to reduce bloat, some PRs may not be accepted
 
   - type: textarea
     id: feature-description