enhance: Add canCreateChannel role policy

[Copilot]

What

Adds canCreateChannel role policy to control channel creation permissions via roles.

Changes:

• Added canCreateChannel boolean policy to RolePolicies type and defaults
• Enforced via requiredRolePolicy on /channels/create endpoint
• Added to role JSON schema and misskey-js constants
• Added frontend UI for policy configuration in admin role settings
• Localized in en-US and ja-JP

Default: true (backward compatible - existing users retain channel creation access)

Why

Enables moderators to restrict channel creation as a moderation tool, as requested in the issue.

Additional info (optional)

Policy follows existing can* permission patterns (OR aggregation - any role with true grants access). Returns ROLE_PERMISSION_DENIED when denied.

Frontend UI includes:

• Base role settings page: Toggle for canCreateChannel policy
• Role editor page: Full configuration with "Use Base Value", enable/disable toggle, and priority selection (Low/Middle/High)

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

Original prompt

---

This section details on the original issue you should resolve

<issue_title>チャンネルを作成できるか否かをロールで制御できるようにする</issue_title>
<issue_description>### Summary

チャンネルを作成できるか否かを制御するロールポリシーを追加する(canCreateChannel)

Purpose

モデレーション

Do you want to implement this feature yourself?

• Yes, I will implement this by myself and send a pull request</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes チャンネルを作成できるか否かをロールで制御できるようにする #17120

---

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[syuilo]

@copilot canCreateChannelポリシーの設定を行うフロントエンド側の実装が抜けているようです

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.68%. Comparing base (a18c909) to head (4d2b8f4).
⚠️ Report is 27 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #17121      +/-   ##
===========================================
+ Coverage    63.65%   63.68%   +0.02%     
===========================================
  Files         1161     1164       +3     
  Lines       116313   116749     +436     
  Branches      8407     8499      +92     
===========================================
+ Hits         74042    74354     +312     
- Misses       40063    40209     +146     
+ Partials      2208     2186      -22     

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[Copilot]

@copilot canCreateChannelポリシーの設定を行うフロントエンド側の実装が抜けているようです

Added frontend UI configuration in commit cd767b2. The canCreateChannel policy can now be configured in:

• Base role settings (admin/roles)
• Individual role editor (admin/roles/edit)

Both include the standard policy controls (enable/disable toggle, priority settings, and "Use Base Value" option).

[github-actions]

このPRによるapi.jsonの差分

差分はこちら

--- base
+++ head
@@ -92888,6 +92888,9 @@
           "canHideAds": {
             "type": "boolean"
           },
+          "canCreateChannel": {
+            "type": "boolean"
+          },
           "driveCapacityMb": {
             "type": "integer"
           },
@@ -92984,6 +92987,7 @@
           "canSearchUsers",
           "canUseTranslator",
           "canHideAds",
+          "canCreateChannel",
           "driveCapacityMb",
           "maxFileSizeMb",
           "uploadableFileTypes",

Get diff files from Workflow Page

[github-actions]

Backend memory usage comparison

Before GC

Metric	base (MB)	head (MB)	Diff (MB)	Diff (%)
VmRSS	327.04 MB	321.09 MB	-5.95 MB	-1.81%
VmHWM	327.04 MB	321.09 MB	-5.95 MB	-1.81%
VmSize	23120.27 MB	23113.73 MB	-6.53 MB	-0.02%
VmData	1390.38 MB	1383.27 MB	-7.11 MB	-0.51%

After GC

Metric	base (MB)	head (MB)	Diff (MB)	Diff (%)
VmRSS	327.05 MB	321.10 MB	-5.95 MB	-1.82%
VmHWM	327.05 MB	321.10 MB	-5.95 MB	-1.82%
VmSize	23120.52 MB	23113.73 MB	-6.78 MB	-0.02%
VmData	1390.63 MB	1383.27 MB	-7.36 MB	-0.52%

After Request

Metric	base (MB)	head (MB)	Diff (MB)	Diff (%)
VmRSS	327.47 MB	321.52 MB	-5.94 MB	-1.81%
VmHWM	327.47 MB	321.52 MB	-5.94 MB	-1.81%
VmSize	23120.69 MB	23113.82 MB	-6.87 MB	-0.02%
VmData	1390.72 MB	1383.35 MB	-7.36 MB	-0.52%

See workflow logs for details

[kakkokari-gtyih]

なおした（Changelogだけまだ）

[kakkokari-gtyih]

コンフリクト解消