feat: Add agent workspace system and runtime management

- Add agent core modules (agent_core, factory, registry, skill_loader)
- Add runtime system for agent execution management
- Add REST API for agents, workspaces, and runtime control
- Add process supervisor for agent lifecycle management
- Add workspace template system with agent profiles
- Add frontend RuntimeView and runtime API integration
- Add per-agent skill workspaces for smoke_fullstack run
- Refactor skill system with active/installed separation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/workspaces/.template/PROFILE.md

@@ -0,0 +1,13 @@
+# Profile
+
+## 投资风格
+- 风险承受能力：中等
+- 投资期限：中期（3-12个月）
+- 偏好行业：科技、医疗、消费
+
+## 优势
+- 财务分析
+- 趋势识别
+
+## 改进方向
+- 市场情绪把握