Plugins UI + API

[yondonfu]

Summary

• Add Settings dialog with General and Plugins tabs in the frontend
• Add complete plugin management UI: install, uninstall, upgrade, and reload plugins
• Add plugin management API endpoints with proper dependency resolution
• Refactor CLI plugin commands to use PluginManager for consistency with API
• Add venv snapshot rollback on plugin install failure
• Add deep link support for plugin installation in Electron (daydream-scope://install?package=...)
• Add plugin architecture documentation and user guide

Key Changes

Frontend

• New Settings dialog with tabs for General settings and Plugins management
• Plugins tab shows installed plugins with version, source, and pipeline info
• Support for installing from PyPI, Git URLs, and local paths (editable)

Backend

• New PluginManager class with async methods for plugin lifecycle
• Plugin install uses compile-based dependency resolution with project constraints
• Automatic rollback via VenvSnapshot if installation fails
• Plugin tracking via plugins.txt and resolved.txt
• CLI commands (plugins, install, uninstall) now use PluginManager

Electron

• Deep link handler for daydream-scope://install protocol
• Managed Python process lifecycle for plugin operations

Breaking Changes

• install command: Now takes single PACKAGE argument (was multiple). Removed --force-reinstall, --no-cache-dir, -y flags.
• uninstall command: Now takes single NAME argument (was multiple). Removed -y flag.

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