Use default Wails asset handler + GetStoredConfig binding

- Remove custom asset handler — it broke Wails IPC routing
- Use application.AssetFileServerFS(distFS) so Wails serves its own runtime
- Add GetStoredConfig binding: SPA calls it on startup to retrieve keychain config
- main.ts: loadDesktopConfig() fetches stored creds before mounting
- Remove runtime.js embed (Wails serves it internally)

web/src/main.ts

@@ -1,11 +1,29 @@
 import { mount } from 'svelte'
 import App from './App.svelte'
 import './app.css'
-import { initConfig } from '$lib/config'
+import { initConfig, setConfig } from '$lib/config'
 
-initConfig()
+async function loadDesktopConfig() {
+  const wails = (window as any).wails
+  if (!wails?.Call?.ByName) return
 
-requestAnimationFrame(() => import('./lib/renderers'))
+  try {
+    const cfg = await wails.Call.ByName('GetStoredConfig')
+    if (cfg?.apiUrl && cfg?.token) {
+      setConfig({ apiUrl: cfg.apiUrl, token: cfg.token, isDesktop: true })
+    }
+  } catch {
+    // no stored config — Config page will handle it
+  }
+}
 
-const app = mount(App, { target: document.getElementById('app')! })
-export default app
+async function start() {
+  initConfig()
+  await loadDesktopConfig()
+
+  requestAnimationFrame(() => import('./lib/renderers'))
+
+  mount(App, { target: document.getElementById('app')! })
+}
+
+start()