feat(aia): Complete AIA V2.0 with universal streaming capabilities

Major Updates:
- Add StreamingService with OpenAI Compatible format (backend/common/streaming)
- Upgrade Chat component V2 with Ant Design X integration
- Implement AIA module with 12 intelligent agents
- Create AgentHub with 100% prototype V11 restoration
- Create ChatWorkspace with streaming response support
- Add ThinkingBlock for deep thinking display
- Add useAIStream Hook for OpenAI Compatible stream handling

Backend Common Capabilities (~400 lines):
- OpenAIStreamAdapter: SSE adapter with OpenAI format
- StreamingService: unified streaming service
- Support content and reasoning_content dual streams
- Deep thinking tag processing (<think>...</think>)

Frontend Common Capabilities (~2000 lines):
- AIStreamChat: modern streaming chat component
- ThinkingBlock: collapsible deep thinking display
- ConversationList: conversation management with grouping
- useAIStream: OpenAI Compatible stream handler Hook
- useConversations: conversation state management Hook
- Modern design styles (Ultramodern theme)

AIA Module Frontend (~1500 lines):
- AgentHub: 12 agent cards with timeline design
- ChatWorkspace: fullscreen immersive chat interface
- AgentCard: theme-colored cards (blue/yellow/teal/purple)
- 5 phases, 12 agents configuration
- Responsive layout (desktop + mobile)

AIA Module Backend (~900 lines):
- agentService: 12 agents config with system prompts
- conversationService: refactored with StreamingService
- attachmentService: file upload skeleton (30k token limit)
- 12 API endpoints with authentication
- Full CRUD for conversations and messages

Documentation:
- AIA module status and development guide
- Universal capabilities catalog (11 services)
- Quick reference card for developers
- System overview updates

Testing:
- Stream response verified (HTTP 200)
- Authentication working correctly
- Auto conversation creation working
- Deep thinking display working
- Message input and send working

Status: Core features completed (85%), attachment and history loading pending

frontend-v2/src/shared/components/Chat/styles/conversation-list.css

@@ -0,0 +1,213 @@
+/**
+ * ConversationList 会话列表样式
+ * 
+ * 现代感设计（参考 Ant Design X Ultramodern）：
+ * - 简洁清爽
+ * - 柔和阴影
+ * - 流畅过渡
+ */
+
+.conversation-list {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+  width: 280px;
+  background: #ffffff;
+  border-right: 1px solid #e5e7eb;
+}
+
+/* 头部 */
+.conversation-list-header {
+  padding: 20px 16px;
+  border-bottom: 1px solid #f3f4f6;
+}
+
+.conversation-list-logo {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.conversation-list-logo .default-logo {
+  font-size: 24px;
+  color: #6366f1;
+}
+
+.conversation-list-title {
+  font-size: 18px;
+  font-weight: 600;
+  color: #111827;
+  letter-spacing: -0.02em;
+}
+
+/* 新建会话按钮 */
+.conversation-list-new {
+  padding: 12px 16px;
+}
+
+.new-conversation-btn {
+  height: 44px;
+  border-radius: 12px;
+  border: 1px dashed #d1d5db;
+  background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
+  color: #6366f1;
+  font-weight: 500;
+  transition: all 0.3s ease;
+}
+
+.new-conversation-btn:hover {
+  border-color: #6366f1;
+  background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
+  color: #4f46e5;
+  transform: translateY(-1px);
+  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.15);
+}
+
+/* 会话列表内容 */
+.conversation-list-content {
+  flex: 1;
+  overflow-y: auto;
+  padding: 8px 12px;
+}
+
+/* 分组标签 */
+.conversation-group {
+  margin-bottom: 16px;
+}
+
+.conversation-group-label {
+  padding: 8px 4px;
+  font-size: 12px;
+  font-weight: 500;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+}
+
+/* 会话项 */
+.conversation-item {
+  display: flex;
+  align-items: flex-start;
+  gap: 12px;
+  padding: 12px;
+  border-radius: 12px;
+  cursor: pointer;
+  transition: all 0.2s ease;
+  margin-bottom: 4px;
+  position: relative;
+}
+
+.conversation-item:hover {
+  background: #f9fafb;
+}
+
+.conversation-item.active {
+  background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
+}
+
+.conversation-item.active::before {
+  content: '';
+  position: absolute;
+  left: 0;
+  top: 50%;
+  transform: translateY(-50%);
+  width: 3px;
+  height: 24px;
+  background: #6366f1;
+  border-radius: 0 3px 3px 0;
+}
+
+/* 会话图标 */
+.conversation-item-icon {
+  flex-shrink: 0;
+  width: 36px;
+  height: 36px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 10px;
+  background: #f3f4f6;
+  color: #6b7280;
+  font-size: 16px;
+}
+
+.conversation-item.active .conversation-item-icon {
+  background: #6366f1;
+  color: white;
+}
+
+.agent-icon {
+  font-size: 20px;
+}
+
+/* 会话内容 */
+.conversation-item-content {
+  flex: 1;
+  min-width: 0;
+  overflow: hidden;
+}
+
+.conversation-item-title {
+  font-size: 14px;
+  font-weight: 500;
+  color: #111827;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  line-height: 1.4;
+}
+
+.conversation-item-preview {
+  font-size: 12px;
+  color: #6b7280;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  margin-top: 4px;
+  line-height: 1.4;
+}
+
+/* 更多按钮 */
+.conversation-item-more {
+  opacity: 0;
+  flex-shrink: 0;
+  color: #9ca3af;
+  transition: opacity 0.2s ease;
+}
+
+.conversation-item:hover .conversation-item-more {
+  opacity: 1;
+}
+
+/* 空状态 */
+.conversation-empty {
+  padding: 40px 20px;
+}
+
+/* 滚动条 */
+.conversation-list-content::-webkit-scrollbar {
+  width: 6px;
+}
+
+.conversation-list-content::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.conversation-list-content::-webkit-scrollbar-thumb {
+  background: #e5e7eb;
+  border-radius: 3px;
+}
+
+.conversation-list-content::-webkit-scrollbar-thumb:hover {
+  background: #d1d5db;
+}
+
+/* 响应式 */
+@media (max-width: 768px) {
+  .conversation-list {
+    width: 100%;
+    border-right: none;
+    border-bottom: 1px solid #e5e7eb;
+    max-height: 40vh;
+  }
+}
+