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/components/shared/ModelModal.js

@@ -1001,7 +1001,20 @@ async function openFileLocation(filePath) {
             body: JSON.stringify({ 'file_path': filePath })
         });
         if (!resp.ok) throw new Error('Failed to open file location');
-        showToast('modals.model.openFileLocation.success', {}, 'success');
+
+        const data = await resp.json();
+
+        if (data.mode === 'clipboard' && data.path) {
+            try {
+                await navigator.clipboard.writeText(data.path);
+                showToast('modals.model.openFileLocation.copied', { path: data.path }, 'success');
+            } catch (clipboardErr) {
+                console.warn('Clipboard API not available:', clipboardErr);
+                showToast('modals.model.openFileLocation.clipboardFallback', { path: data.path }, 'info');
+            }
+        } else {
+            showToast('modals.model.openFileLocation.success', {}, 'success');
+        }
     } catch (err) {
         showToast('modals.model.openFileLocation.failed', {}, 'error');
     }