feat: add unified visual interface launcher

Implements unified dashboard combining Flow Builder, Claw Dashboard, and Chat UI
at localhost:3000. Users can now access all PraisonAI visual interfaces from
one place:

- Flow Visual Builder (port 7860) - Create agents and workflows visually
- Claw Dashboard (port 8082) - Full featured dashboard with Telegram/Discord bots
- Clean Chat UI (port 8081) - Simple chat interface

New command: praisonai unified
- Single entry point at localhost:3000
- On-demand service launching
- Real-time service status monitoring
- Responsive iframe-based interface

Fixes #1369

Co-authored-by: praisonai-triage-agent[bot] <praisonai-triage-agent[bot]@users.noreply.github.com>

Author: praisonai-triage-agent[bot]

src/praisonai/praisonai/cli/app.py

@@ -238,6 +238,7 @@ def register_commands():
     from .commands.sandbox import app as sandbox_app
     from .commands.claw import app as claw_app
     from .commands.flow import app as flow_app
+    from .commands.unified import app as unified_app
     from .commands.langfuse import app as langfuse_app
     from .commands.port import app as port_app
     from .commands.managed import app as managed_app
@@ -422,6 +423,7 @@ def app_cmd(
     app.add_typer(sandbox_app, name="sandbox", help="Sandbox container management")
     app.add_typer(claw_app, name="claw", help="🦞 PraisonAI Dashboard (full UI)")
     app.add_typer(flow_app, name="flow", help="Visual workflow builder (Langflow)")
+    app.add_typer(unified_app, name="unified", help="🌟 Unified Interface (Flow + Claw + UI)")
     app.add_typer(langfuse_app, name="langfuse", help="🔍 Langfuse observability platform")
     app.add_typer(port_app, name="port", help="🔌 Manage port usage and resolve conflicts")