Add Flatpak packaging for Patchwork 5.4.0

Bundle Poncho Wonky (Patchwork 5.4.0) for x86_64 and aarch64 on the
24.08 freedesktop runtime with the Electron BaseApp. Launcher forces
Wayland when a socket is present so the app starts from terminals
outside the desktop session. Pinned versions and checksums live in
versions.sh and are validated by check-versions.sh.

nz.scuttlebutt.Patchwork.metainfo.xml

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id>nz.scuttlebutt.Patchwork</id>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>AGPL-3.0</project_license>
+  <name>Patchwork</name>
+  <summary>A decentralized messaging and sharing app</summary>
+  <developer id="nz.scuttlebutt">
+    <name>Secure Scuttlebutt Consortium</name>
+  </developer>
+  <description>
+    <p>
+      A decentralized messaging and sharing app built on top of Secure
+      Scuttlebutt (SSB).
+    </p>
+  </description>
+  <launchable type="desktop-id">nz.scuttlebutt.Patchwork.desktop</launchable>
+  <!-- TODO(flathub): add a <screenshots> section hosted on a stable CDN.
+       The upstream screenshot URL is currently 404. -->
+  <url type="homepage">https://www.scuttlebutt.nz/</url>
+  <url type="bugtracker">https://github.com/soapdog/patchwork/issues</url>
+  <categories>
+    <category>Network</category>
+    <category>Chat</category>
+    <category>Feed</category>
+  </categories>
+  <content_rating type="oars-1.1">
+    <content_attribute id="violence-cartoon">none</content_attribute>
+    <content_attribute id="violence-fantasy">none</content_attribute>
+    <content_attribute id="violence-realistic">none</content_attribute>
+    <content_attribute id="violence-bloodshed">none</content_attribute>
+    <content_attribute id="violence-sexual">none</content_attribute>
+    <content_attribute id="violence-desecration">none</content_attribute>
+    <content_attribute id="violence-slavery">none</content_attribute>
+    <content_attribute id="violence-worship">none</content_attribute>
+    <content_attribute id="drugs-alcohol">none</content_attribute>
+    <content_attribute id="drugs-narcotics">none</content_attribute>
+    <content_attribute id="drugs-tobacco">none</content_attribute>
+    <content_attribute id="sex-nudity">none</content_attribute>
+    <content_attribute id="sex-themes">none</content_attribute>
+    <content_attribute id="sex-homosexuality">none</content_attribute>
+    <content_attribute id="sex-prostitution">none</content_attribute>
+    <content_attribute id="sex-adultery">none</content_attribute>
+    <content_attribute id="sex-appearance">none</content_attribute>
+    <content_attribute id="language-profanity">none</content_attribute>
+    <content_attribute id="language-humor">none</content_attribute>
+    <content_attribute id="language-discrimination">none</content_attribute>
+    <content_attribute id="social-chat">intense</content_attribute>
+    <content_attribute id="social-info">none</content_attribute>
+    <content_attribute id="social-audio">none</content_attribute>
+    <content_attribute id="social-location">none</content_attribute>
+    <content_attribute id="social-contacts">none</content_attribute>
+    <content_attribute id="money-purchasing">none</content_attribute>
+    <content_attribute id="money-gambling">none</content_attribute>
+  </content_rating>
+  <releases>
+    <release version="5.4.0" date="2026-07-30"/>
+  </releases>
+</component>