feat: auto-initialize config files on Electron app startup

Ensure models.json, mcp.json, and security.json config files are created
when the app starts, before the Settings UI can access them.

- Add ensureConfig() method to IModelConfigRepo and IMcpConfigRepo interfaces
- Add async ensureSecurityConfig() function for security config initialization
- Create initConfigs.ts with centralized initialization that calls all config ensure methods
- Call initConfigs() in main.ts before setupIpcHandlers()

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/x/apps/main/src/main.ts

@@ -10,6 +10,7 @@ import { init as initFirefliesSync } from "@x/core/dist/knowledge/sync_fireflies
 import { init as initGranolaSync } from "@x/core/dist/knowledge/granola/sync.js";
 import { init as initGraphBuilder } from "@x/core/dist/knowledge/build_graph.js";
 import { init as initPreBuiltRunner } from "@x/core/dist/pre_built/runner.js";
+import { initConfigs } from "@x/core/dist/config/initConfigs.js";
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
@@ -96,7 +97,7 @@ function createWindow() {
   }
 }
 
-app.whenReady().then(() => {
+app.whenReady().then(async () => {
   // Register custom protocol before creating window (for production builds)
   if (app.isPackaged) {
     registerAppProtocol();
@@ -113,6 +114,9 @@ app.whenReady().then(() => {
     });
   }
 
+  // Initialize all config files before UI can access them
+  await initConfigs();
+
   setupIpcHandlers();
 
   createWindow();