chore: remove ~13,000 lines of dead Electron code

All business logic has been migrated to the REST API server. This removes
obsolete Electron IPC handlers and services that are no longer used:

- Deleted electron/services/ directory (18 files)
- Deleted electron/agent-service.js
- Deleted electron/auto-mode-service.js
- Renamed main-simplified.js → main.js
- Renamed preload-simplified.js → preload.js
- Removed unused dependencies from package.json

The Electron layer now only handles native OS features (10 IPC handlers):
- File dialogs, shell operations, and app info

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/app/package.json

@@ -29,11 +29,9 @@
     "dev:electron:wsl:gpu": "concurrently \"next dev -p 3007\" \"wait-on http://localhost:3007 && MESA_D3D12_DEFAULT_ADAPTER_NAME=NVIDIA electron . --no-sandbox --disable-gpu-sandbox\""
   },
   "dependencies": {
-    "@anthropic-ai/claude-agent-sdk": "^0.1.61",
     "@dnd-kit/core": "^6.3.1",
     "@dnd-kit/sortable": "^10.0.0",
     "@dnd-kit/utilities": "^3.2.2",
-    "@homebridge/node-pty-prebuilt-multiarch": "^0.13.1",
     "@radix-ui/react-checkbox": "^1.3.3",
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-dropdown-menu": "^2.1.16",
@@ -97,8 +95,7 @@
       "electron/**/*",
       ".next/**/*",
       "public/**/*",
-      "!node_modules/**/*",
-      "node_modules/@anthropic-ai/**/*"
+      "!node_modules/**/*"
     ],
     "extraResources": [
       {