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.

locales/en.json

@@ -231,9 +231,11 @@
         "civitaiApiKeyHelp": "Used for authentication when downloading models from Civitai",
         "openSettingsFileLocation": {
             "label": "Open settings folder",
-            "tooltip": "Open the folder containing settings.json",
+            "tooltip": "Open folder containing settings.json",
             "success": "Opened settings.json folder",
-            "failed": "Failed to open settings.json folder"
+            "failed": "Failed to open settings.json folder",
+            "copied": "Settings path copied to clipboard: {{path}}",
+            "clipboardFallback": "Settings path: {{path}}"
         },
         "sections": {
             "contentFiltering": "Content Filtering",
@@ -895,7 +897,9 @@
             },
             "openFileLocation": {
                 "success": "File location opened successfully",
-                "failed": "Failed to open file location"
+                "failed": "Failed to open file location",
+                "copied": "Path copied to clipboard: {{path}}",
+                "clipboardFallback": "Path: {{path}}"
             },
             "metadata": {
                 "version": "Version",