ci: add signed release workflow and fastlane metadata

Adds a Forgejo Actions workflow that builds a release APK on tag push,
reading signing credentials from repo secrets with a debug-key fallback
for local builds, and publishes the APK plus fastlane changelog to a
Forgejo release.

fastlane/Fastfile

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+default_platform(:android)

fastlane/metadata/android/en-US/changelogs/3.txt

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+Added D-pad navigation for TV/remote and hardware-keyboard devices.

fastlane/metadata/android/en-US/full_description.txt

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+Plasmoid is a minimalist and opinionated app launcher for Android.
+
+Features:
+
+* Search & Launch — Start typing to filter apps by name or tag. Tap to launch immediately.
+* Tagging — Long-press an app and choose Edit Tags to assign tags. Tags are searchable using prefixes: @context, #general, +project.
+* Gestures — Swipe right to pin an app to the top (swipe right again to unpin). Swipe left to demote an app to the bottom (swipe left again to restore). Long-press for Edit Tags, App Info, and more.
+* D-Pad — From the search field, press down to close the keyboard and move into the list, or right to clear the search (or open the menu when it's empty). In the list, up and down move the selection, center launches, left returns to the search field, and right opens the menu. Hold left to promote an app (pin or restore it), hold right to demote it (unpin or move it to the bottom), and hold center to open or close the app menu.
+* Settings — Toggle icon visibility, color mode, theme, sort order, auto-focus, status icons, and demoted app visibility from the menu.

fastlane/metadata/android/en-US/short_description.txt

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+A minimalist and opinionated app launcher with tagging and D-pad support.

fastlane/metadata/android/en-US/title.txt

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+Plasmoid