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

[SuperComboGamer]

Body:

Summary

• Removed obsolete Electron IPC handlers and services that were replaced by REST API
• Deleted electron/services/ directory (18 files)
• Deleted electron/agent-service.js and electron/auto-mode-service.js
• Renamed main-simplified.js → main.js and preload-simplified.js → preload.js
• Removed unused dependencies from app package.json

What Remains

The Electron layer now only handles 10 IPC handlers for native OS features:

• File dialogs
• Shell operations
• App info

All business logic uses the REST API server.

Stats

• 26 files changed
• 11,309 deletions
• 218 additions

[gemini-code-assist]

Summary of Changes

Hello @SuperComboGamer, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on a major architectural cleanup, removing a substantial amount of legacy Electron code that was no longer necessary due to the adoption of a REST API for core functionalities. The goal is to create a leaner, more maintainable Electron application that primarily serves as a wrapper for native OS interactions, while offloading complex business logic to a separate backend server. This change drastically reduces the Electron codebase footprint and simplifies its role within the application.

Highlights

• Codebase Reduction: Approximately 13,000 lines of obsolete Electron-specific code have been removed, significantly streamlining the application's architecture.
• Electron Simplification: The Electron main and preload processes have been simplified to handle only 10 core native OS features, delegating all other business logic to the REST API server.
• IPC Handler Removal: Obsolete Electron IPC handlers and services, previously used for agent and auto-mode functionalities, have been entirely removed as they were replaced by the REST API.
• Dependency Cleanup: Unused dependencies related to the removed Electron services, such as @anthropic-ai/claude-agent-sdk and @homebridge/node-pty-prebuilt-multiarch, have been removed from package.json.
• File Renaming: The main Electron entry points main-simplified.js and preload-simplified.js have been renamed to main.js and preload.js respectively, reflecting the new simplified architecture.

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[gemini-code-assist]

Code Review

This pull request is a major refactoring that removes approximately 13,000 lines of dead code from the Electron application by moving all business logic to a separate backend server. The Electron layer is now a thin client responsible only for native OS features like file dialogs and shell operations, communicating with the backend via a REST API. This is an excellent architectural improvement that simplifies the codebase and separates concerns effectively. My review found one minor regression where the handler for opening external links was removed, which I've suggested adding back.