Self-hosted auto-updates from Gitea via PUC + proprietary licence

Vendors YahnisElsts/plugin-update-checker v5.7 under vendor/ and wires
it to poll updates.json on the repo main branch. WP surfaces new
versions via Dashboard → Updates on its normal twice-daily cadence.

PUC is vendored (not a submodule) so Gitea's archive/main.zip — the
download target — includes it.

Also relicenses from GPL-2.0-or-later to a proprietary licence granting
use only to authorised sites, with all other rights reserved. Plugin
URI + Author URI switched from the placeholder github.com URL to the
canonical Gitea repo.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

vendor/plugin-update-checker/languages/plugin-update-checker.pot

@@ -0,0 +1,49 @@
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: plugin-update-checker\n"
+"POT-Creation-Date: 2025-05-20 15:27+0300\n"
+"PO-Revision-Date: 2016-01-10 20:59+0100\n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"Language: en_US\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"X-Generator: Poedit 3.6\n"
+"X-Poedit-Basepath: ..\n"
+"X-Poedit-SourceCharset: UTF-8\n"
+"X-Poedit-KeywordsList: __;_e;_x:1,2c;_x\n"
+"X-Poedit-SearchPath-0: .\n"
+
+#: Puc/v5p7/Plugin/Ui.php:130
+msgid "Check for updates"
+msgstr ""
+
+#: Puc/v5p7/Plugin/Ui.php:217
+#, php-format
+msgctxt "the plugin title"
+msgid "The %s plugin is up to date."
+msgstr ""
+
+#: Puc/v5p7/Plugin/Ui.php:219
+#, php-format
+msgctxt "the plugin title"
+msgid "A new version of the %s plugin is available."
+msgstr ""
+
+#: Puc/v5p7/Plugin/Ui.php:221
+#, php-format
+msgctxt "the plugin title"
+msgid "Could not determine if updates are available for %s."
+msgstr ""
+
+#: Puc/v5p7/Plugin/Ui.php:227
+#, php-format
+msgid "Unknown update checker status \"%s\""
+msgstr ""
+
+#: Puc/v5p7/Vcs/PluginUpdateChecker.php:113
+msgid "There is no changelog available."
+msgstr ""