fix: gen-manifest.sh/README/gitignore同步manifest-stable.json命名

ota/gen-manifest.sh

@@ -12,7 +12,7 @@ APK_NAME="v${VERSION_NAME}-dav-android-${VERSION_CODE}-debug.apk"
 SHA256=$(sha256sum "$APK_PATH" | cut -d' ' -f1)
 SIZE=$(stat -c%s "$APK_PATH")
 
-cat > ota/manifest.json <<JSON
+cat > ota/manifest-stable.json <<JSON
 {
   "version": "${VERSION_NAME}",
   "builds": {
@@ -29,7 +29,7 @@ cat > ota/manifest.json <<JSON
 }
 JSON
 
-echo "Generated: ota/manifest.json"
+echo "Generated: ota/manifest-stable.json"
 echo "  tag:    ${RELEASE_TAG}"
 echo "  sha256: ${SHA256}"
 echo "  size:   ${SIZE}"