feat(frontend): 添加 Zustand store 架构

- 创建 5 个领域 store：runtimeStore, marketStore, portfolioStore, agentStore, uiStore
- 更新 CLAUDE.md 记录架构改进
- Zustand 已安装但 stores 尚未在 App.jsx 中使用（渐进迁移）

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

frontend/src/store/agentStore.js

@@ -0,0 +1,58 @@
+import { create } from 'zustand';
+
+/**
+ * Agent Store - Agent skills, profiles, workspaces
+ */
+export const useAgentStore = create((set) => ({
+  // Selected agent for skill/workspace editing
+  selectedSkillAgentId: null,
+  setSelectedSkillAgentId: (selectedSkillAgentId) => set({ selectedSkillAgentId }),
+
+  // Agent profiles
+  agentProfilesByAgent: {},
+  setAgentProfilesByAgent: (agentProfilesByAgent) => set({ agentProfilesByAgent }),
+
+  // Agent skills
+  agentSkillsByAgent: {},
+  setAgentSkillsByAgent: (agentSkillsByAgent) => set({ agentSkillsByAgent }),
+
+  // Skill details
+  skillDetailsByName: {},
+  setSkillDetailsByName: (skillDetailsByName) => set({ skillDetailsByName }),
+
+  // Local skill drafts
+  localSkillDraftsByKey: {},
+  setLocalSkillDraftsByKey: (localSkillDraftsByKey) => set({ localSkillDraftsByKey }),
+
+  // Loading states
+  isAgentSkillsLoading: false,
+  setIsAgentSkillsLoading: (isAgentSkillsLoading) => set({ isAgentSkillsLoading }),
+
+  skillDetailLoadingKey: null,
+  setSkillDetailLoadingKey: (skillDetailLoadingKey) => set({ skillDetailLoadingKey }),
+
+  agentSkillsSavingKey: null,
+  setAgentSkillsSavingKey: (agentSkillsSavingKey) => set({ agentSkillsSavingKey }),
+
+  agentSkillsFeedback: null,
+  setAgentSkillsFeedback: (agentSkillsFeedback) => set({ agentSkillsFeedback }),
+
+  // Workspace files
+  selectedWorkspaceFile: null,
+  setSelectedWorkspaceFile: (selectedWorkspaceFile) => set({ selectedWorkspaceFile }),
+
+  workspaceFilesByAgent: {},
+  setWorkspaceFilesByAgent: (workspaceFilesByAgent) => set({ workspaceFilesByAgent }),
+
+  workspaceDraftContent: '',
+  setWorkspaceDraftContent: (workspaceDraftContent) => set({ workspaceDraftContent }),
+
+  isWorkspaceFileLoading: false,
+  setIsWorkspaceFileLoading: (isWorkspaceFileLoading) => set({ isWorkspaceFileLoading }),
+
+  workspaceFileSavingKey: null,
+  setWorkspaceFileSavingKey: (workspaceFileSavingKey) => set({ workspaceFileSavingKey }),
+
+  workspaceFileFeedback: null,
+  setWorkspaceFileFeedback: (workspaceFileFeedback) => set({ workspaceFileFeedback }),
+}));