Fix: Synchronize SvelteKit relay and enhance native command testing

- Updated electron_relay.ts with full Phase 3 command set (run_cmd_sync, kill_processes, get_device_info).
- Fixed 500 error in Event Location by standardizing enabled/hidden flags.
- Hardened native environment detection in root layout.
- Added Manual OS Command input to Launcher Configuration for Phase 3 testing.

src/routes/events/[event_id]/(launcher)/launcher_cfg.svelte

@@ -68,7 +68,7 @@
                         {:else}
                             <span class="fas fa-chevron-right"></span>
                         {/if}
-                        Native OS Folders
+                        Native OS Handlers & Folders
                     </span>
                     <span class="badge variant-filled-success">Active</span>
                 </button>