Unify agent and viewer into single guruconnect binary

- Renamed package from guruconnect-agent to guruconnect
- Added CLI subcommands: agent, view, install, uninstall, launch
- Moved viewer code into agent/src/viewer module
- Added install module with:
  - UAC elevation attempt with user-install fallback
  - Protocol handler registration (guruconnect://)
  - System-wide install to Program Files or user install to LocalAppData
- Single binary now handles both receiving and initiating connections
- Protocol URL format: guruconnect://view/SESSION_ID?token=API_KEY

Usage:
  guruconnect agent              - Run as background agent
  guruconnect view <session_id>  - View a remote session
  guruconnect install            - Install and register protocol
  guruconnect launch <url>       - Handle guruconnect:// URL

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

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

Cargo.toml

@@ -3,7 +3,6 @@ resolver = "2"
 members = [
     "agent",
     "server",
-    "viewer",
 ]
 
 [workspace.package]