Fix: Standardize Electron bridge and implement robust caching

- Refactored all IPC methods and parameters to snake_case for consistency with SvelteKit.
- Implemented exhaustive background caching engine with download locking.
- Reverted to legacy-proven flat hash storage pattern (hash.file).
- Added axios for reliable stream-based binary downloads.
- Updated preload and main handlers to support recursive room data fetching.

src/preload/index.ts

@@ -1,8 +1,18 @@
 import { contextBridge, ipcRenderer } from 'electron';
 
 contextBridge.exposeInMainWorld('aetherNative', {
-  getSeedConfig: () => ipcRenderer.invoke('get-seed-config'),
-  getDeviceConfig: () => ipcRenderer.invoke('get-device-config'),
-  getJWT: () => ipcRenderer.invoke('get-jwt'),
+  get_seed_config: () => ipcRenderer.invoke('get-seed-config'),
+  get_device_config: () => ipcRenderer.invoke('get-device-config'),
+  get_jwt: () => ipcRenderer.invoke('get-jwt'),
   log: (message: string) => console.log('[Native Log]', message),
+  
+  // Shell Handlers
+  open_folder: (path: string) => ipcRenderer.invoke('native:open-folder', path),
+  run_command: (args: any) => ipcRenderer.invoke('native:run-cmd', args),
+  launch_file: (path: string) => ipcRenderer.invoke('native:launch-file', path),
+
+  // File/Cache Handlers
+  check_cache: (args: any) => ipcRenderer.invoke('native:check-cache', args),
+  download_to_cache: (args: any) => ipcRenderer.invoke('native:download-to-cache', args),
+  launch_from_cache: (args: any) => ipcRenderer.invoke('native:launch-from-cache', args),
 });