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>

plan.md

@@ -224,10 +224,11 @@ NEXT_PUBLIC_SERVER_URL=http://localhost:3008
   - `apps/server/src/routes/running-agents.ts` - active agent tracking
 
 - [x] **Phase 7**: Simplify Electron
-  - `apps/app/electron/main-simplified.js` - spawns server, minimal IPC
-  - `apps/app/electron/preload-simplified.js` - only native features exposed
+  - `apps/app/electron/main.js` - spawns server, minimal IPC (10 handlers for native features only)
+  - `apps/app/electron/preload.js` - only native features exposed
   - Updated `electron.ts` to detect simplified mode
   - Updated `http-api-client.ts` to use native dialogs when available
+  - Removed ~13,000 lines of dead code (obsolete services, agent-service.js, auto-mode-service.js)
 
 - [x] **Phase 8**: Production ready
   - `apps/server/src/lib/auth.ts` - API key authentication middleware