feat: add WSL and Docker support for file location opening

- Add WSL detection and Windows path conversion using wslpath
- Add Docker/Kubernetes detection via /.dockerenv and /proc/1/cgroup
- Implement clipboard fallback for containerized environments
- Update open_file_location handler to detect WSL/Docker before POSIX
- Update open_settings_location handler with same detection logic
- Add clipboard API integration with graceful fallback in frontend
- Add translations for clipboard feature across all 10 languages
- Add unit tests for _is_wsl(), _is_docker(), and _wsl_to_windows_path()

Fixes file manager opening failures in WSL and Docker environments.

static/js/managers/SettingsManager.js

@@ -364,7 +364,19 @@ export class SettingsManager {
                 throw new Error(`Request failed with status ${response.status}`);
             }
 
-            showToast('settings.openSettingsFileLocation.success', {}, 'success');
+            const data = await response.json();
+
+            if (data.mode === 'clipboard' && data.path) {
+                try {
+                    await navigator.clipboard.writeText(data.path);
+                    showToast('settings.openSettingsFileLocation.copied', { path: data.path }, 'success');
+                } catch (clipboardErr) {
+                    console.warn('Clipboard API not available:', clipboardErr);
+                    showToast('settings.openSettingsFileLocation.clipboardFallback', { path: data.path }, 'info');
+                }
+            } else {
+                showToast('settings.openSettingsFileLocation.success', {}, 'success');
+            }
         } catch (error) {
             console.error('Failed to open settings file location:', error);
             showToast('settings.openSettingsFileLocation.failed', {}, 'error');