Wireguard ip6prefix support

[nagual2]

• This PR is not from my main or master branch 💩, but a separate branch ✅
• Each commit has a valid ✒️ Signed-off-by: <my@email.address> row (via git commit --signoff)
• Each commit and PR title has a valid 📝 <package name>: title first line subject for packages
• Incremented 🆙 any PKG_VERSION in the Makefile
• Tested on: (architecture, openwrt version, browser) ✅
• ( Preferred ) Mention: @ the original code author for feedback
• ( Preferred ) Screenshot or mp4 of changes:
• ( Optional ) Closes: e.g. openwrt/luci#issue-number
• ( Optional ) Depends on: e.g. openwrt/packages#pr-number in sister repo
• Description: (describe the changes proposed in this PR)

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Commit cc5f83b

• 🔶 Commit subject must be <= 80 (and should be <= 60) characters long
  Actual: subject is 64 characters long
  $\textsf{luci-proto-wireguard: add IPv6 routed prefix (ip6prefix) sup\color{yellow}{port}\color{red}{}}$

Commit 18cedc1

• 🔶 Author name must be either a real name 'firstname lastname' or a nickname/alias/handle
  Actual: Max seems to be a nickname or an alias
  Expected: a real name 'firstname lastname'
• 🔶 Commit(ter) name must be either a real name 'firstname lastname' or a nickname/alias/handle
  Actual: Max seems to be a nickname or an alias
  Expected: a real name 'firstname lastname'
• ❌ Signed-off-by must match author
  Actual: missing or doesn't match author
  Expected: Signed-off-by: Max <max@nagual2.com>
• ❌ Commit message must exist

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