fix: parse linux distro metadata

apps/chanora_flutter/lib/services/startup_dependency_check.dart

@@ -233,24 +233,37 @@ Future<_LinuxDistro> _detectLinuxDistro() async {
     return _LinuxDistro.other;
   }
 
-  final lower = content.toLowerCase();
+  final fields = _parseOsRelease(content);
-  if (lower.contains('id=fedora') ||
+  final id = fields['id'] ?? '';
-      lower.contains('id_like="fedora"') ||
+  final idLike = (fields['id_like'] ?? '').split(RegExp(r'\s+'));
-      lower.contains('id_like=fedora')) {
+  final ids = {id, ...idLike};
+  if (ids.contains('fedora')) {
     return _LinuxDistro.fedora;
   }
-  if (lower.contains('id=ubuntu') ||
+  if (ids.contains('ubuntu') || ids.contains('debian')) {
-      lower.contains('id=debian') ||
-      lower.contains('id_like=debian') ||
-      lower.contains('id_like="ubuntu debian"')) {
     return _LinuxDistro.debian;
   }
-  if (lower.contains('id=arch') || lower.contains('id_like=arch')) {
+  if (ids.contains('arch')) {
     return _LinuxDistro.arch;
   }
   return _LinuxDistro.other;
 }
 
+Map<String, String> _parseOsRelease(String content) {
+  final fields = <String, String>{};
+  for (final line in content.split('\n')) {
+    final separator = line.indexOf('=');
+    if (separator <= 0) continue;
+    final key = line.substring(0, separator).trim().toLowerCase();
+    var value = line.substring(separator + 1).trim().toLowerCase();
+    if (value.length >= 2 && value.startsWith('"') && value.endsWith('"')) {
+      value = value.substring(1, value.length - 1);
+    }
+    fields[key] = value;
+  }
+  return fields;
+}
+
 _LinuxArch _detectLinuxArch() {
   return switch (_currentAbiProvider()) {
     Abi.linuxX64 => _LinuxArch.x64,

apps/chanora_flutter/test/services/startup_dependency_check_test.dart

@@ -38,6 +38,25 @@ void main() {
     expect(sdl.installHints.single.command, 'sudo apt install libsdl2-2.0-0');
   });
 
+  test('distro detection parses quoted ID_LIKE lists', () async {
+    debugResetStartupDependencyCheck(
+      platformIsLinux: () => true,
+      libraryProbe: (candidate) => false,
+      fileExists: (_) async => true,
+      osReleaseProvider: () async => 'ID=rocky\nID_LIKE="fedora rhel"\n',
+      resolvedExecutableProvider: () => '/opt/chanora/chanora_flutter',
+      currentDirectoryProvider: () => '/tmp',
+    );
+
+    final result = await checkStartupDependencies();
+
+    expect(result.platformLabel, 'Fedora');
+    final sdl = result.issues.singleWhere(
+      (issue) => issue.id == 'linux-sdl2-runtime',
+    );
+    expect(sdl.installHints.single.command, 'sudo dnf install SDL2');
+  });
+
   test(
     'missing ONNX runtime is reported as recommended when SDL2 is present',
     () async {