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)

scripts/fdroid_metadata.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+"""Generate F-Droid v2 metadata for a signed APK.
+
+Usage: fdroid_metadata.py <path-to-apk>
+Prints the F-Droid metadata lines to stdout. The workflow separately computes
+the F-Droid signature (base64 of double SHA-256).
+"""
+import hashlib
+import re
+import shutil
+import subprocess
+import sys
+
+
+def main():
+    apk = sys.argv[1]
+    with open(apk, "rb") as f:
+        data = f.read()
+    sha256 = hashlib.sha256(data).hexdigest()
+
+    aapt2 = shutil.which("aapt2")
+    if aapt2 is None:
+        sys.exit("aapt2 not found on PATH; add the Android build-tools dir to PATH")
+
+    dump = subprocess.run([aapt2, "dump", "badging", apk], check=True,
+                          capture_output=True, text=True).stdout
+    m_pkg = re.search(r"package: name='([^']+)'", dump)
+    m_ver = re.search(r"versionName='([^']+)'", dump)
+    m_code = re.search(r"versionCode='(\d+)'", dump)
+    if not (m_pkg and m_ver and m_code):
+        sys.exit(f"could not parse APK badging:\n{dump[:2000]}")
+
+    pkg = m_pkg.group(1)
+    ver = m_ver.group(1)
+    code = int(m_code.group(1))
+
+    lines = [
+        f"VersionName: {ver}",
+        f"VersionCode: {code}",
+        "MinSdkVersion: 24",
+        "TargetSdkVersion: 36",
+        "Permissions:",
+        "  android.permission.INTERNET",
+        "  android.permission.CAMERA",
+        "  android.permission.RECEIVE_BOOT_COMPLETED",
+        "  android.permission.REQUEST_INSTALL_PACKAGES",
+        "  android.permission.SYSTEM_ALERT_WINDOW",
+        "  android.permission.WRITE_EXTERNAL_STORAGE",
+        f"UpdateUrl: https://git.obahan.xyz/frank/wirevpn/releases",
+        f"Sha256Digest: {sha256}",
+        f"AndroidPackageInfoName: {pkg}",
+    ]
+    print("\n".join(lines))
+
+
+if __name__ == "__main__":
+    main()