Issue #3579448: Architecture modernization — replace PHP SDK with Node.js sidecar

Alphons Jaimonrequested to merge
issue/ai_claude_agent_sdk-3579448:3579448-architecture-modernization-sidecar into main

Description:

Replaces the PHP SDK client with a Node.js sidecar using the official @anthropic-ai/claude-agent-sdk TypeScript package. Adds Agent Profile config entities, xterm.js browser terminal, AI Assistants streaming bridge, session management dashboard, skills/scheduled tasks, and DDEV auto-scaffolding. Reworks existing debug submodule, session tracking, and streaming to route through the sidecar. See issue for full breakdown of new vs reworked features.

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