Rebrand WireGuard Android to Wire VPN

- Rename package and all Java/Kotlin sources: com.wireguard.android -> page.onram.wirevpn
- applicationId -> page.onram.wirevpn, version 1.0.20260910 (520)
- New launcher icon: dark circle, white padlock with bold W
- App name 'Wire VPN' in all locales; remove donate preference
- Release signing from KEYSTORE_* env vars (CI)
- F-Droid v2: scripts/fdroid_metadata.py
- GitHub/Gitea Actions workflow: auto-build signed APK + F-Droid
  metadata/signature on every new release, attach to the release
- README + NOTICE (license inventory)

settings.gradle.kts

@@ -16,7 +16,7 @@ dependencyResolutionManagement {
     }
 }
 
-rootProject.name = "wireguard-android"
+rootProject.name = "wire-vpn"
 
 include(":tunnel")
 include(":ui")