Add Agent drag-to-group, QuickTeamAndRun, and XNCF module listing FunctionRenders

[Copilot]

Adds three UX improvements to the AgentsManager module: drag-and-drop agent assignment to groups, a single-step "form a team + execute task" workflow in Admin AI Chat, and a FunctionRender that enumerates all registered XNCF modules with their available functions.

Drag-and-Drop Agent → Group (UI)

• Agent cards are now draggable; dragging one opens a floating overlay listing all groups as drop targets with hover highlighting
• On drop, calls GetChatGroupItem to fetch current members, then SetChatGroup to append the agent — no page reload needed
• CSS entrance animation respects prefers-reduced-motion

QuickTeamAndRun FunctionRender (Backend)

Available in Admin AI Chat. Creates a temporary ChatGroup from selected agents and immediately executes a task — combines the separate "create group" + "run group" steps into one:

Team Name: Sprint Review Team
Members: [Alice, Bob, Charlie]
Admin: Manager
Enter Agent: Coordinator
AI Model: gpt-4o
Command: "Draft a sprint review summary"
→ Creates group, adds members, runs task immediately

GetAvailableXncfModules FunctionRender (Backend)

Lists all modules in XncfRegisterManager.RegisterList with their UID, version, description, and registered FunctionRender entries — enabling AI Chat to discover and attach XNCF module capabilities dynamically.

【Senparc.Xncf.AgentsManager】
  UID: xxx
  版本: 1.0.0
  可用功能 (4 个):
    - 管理 ChatGroup: 管理 ChatGroup
    - 快速组建团队并执行任务: ...
    ...

Changed files: ChatGroupRequest.cs, ChatGroupAppService.cs, Index.cshtml, index.js, index.css

Original prompt

Agent的3D画面中，请从操作层面，提出一些便捷操作的建议。例如，是否可以通过拖动Agent，让它快速加入到某个组里面。

同时，是否可以通过 Admin后台的AI Chat，快速选择或者组建一个团队，然后立即执行任务。

最后，Admin 后台的 AI Chat 功能，是否可以有一个选项，自动附加XNCF模块（选中后先调用一个 functionrender，返回所有可用的 XNCF，就和自动安装模块的逻辑一样）

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