fix: migrate glm-4-flash to glm-4-flash-250414 (model deprecated by Zhipu)

Zhipu AI has deprecated glm-4-flash, causing 404 errors on all chat requests.
Updated all references:
- config: glm-4-flash → glm-4-flash-250414, added glm-z1-flash
- frontend: defaultModel, conversationStore, ChatArea fallback, ModelsAPI

desktop/src/components/ChatArea.tsx

@@ -85,7 +85,7 @@ export function ChatArea({ compact, onOpenDetail }: { compact?: boolean; onOpenD
     }
     // Fallback: provide common models when no backend is connected
     return [
-      { id: 'glm-4-flash', name: 'GLM-4 Flash', provider: 'zhipu' },
+      { id: 'glm-4-flash-250414', name: 'GLM-4 Flash (免费)', provider: 'zhipu' },
       { id: 'gpt-4o', name: 'GPT-4o', provider: 'openai' },
       { id: 'gpt-4o-mini', name: 'GPT-4o Mini', provider: 'openai' },
       { id: 'deepseek-chat', name: 'DeepSeek V3', provider: 'deepseek' },
@@ -575,7 +575,7 @@ export function ChatArea({ compact, onOpenDetail }: { compact?: boolean; onOpenD
   );
 }
 
-function MessageBubble({ message, setInput }: { message: Message; setInput: (text: string) => void }) {
+function MessageBubble({ message, setInput, onRetry }: { message: Message; setInput: (text: string) => void; onRetry?: () => void }) {
   if (message.role === 'tool') {
     return null;
   }