Feature: Chatbox IA avec OpenRouter et sélecteur de modèles

Ajout d'un chatbot interactif alimenté par OpenRouter API avec les fonctionnalités suivantes:
- Bouton flottant en bas à droite pour ouvrir le chat
- Sélecteur de modèles IA avec tous les modèles disponibles via l'API OpenRouter
- Interface de chat avec historique des messages (utilisateur/assistant)
- Indicateur de chargement avec animation
- Boutons pour effacer l'historique et fermer le chat
- Auto-scroll vers le dernier message
- Backend: route POST /api/openrouter/chat pour la communication avec l'API
- Service frontend: méthode sendMessage() dans OpenRouterService

Retrait du composant MadeWithDyad comme demandé.

routes/openrouter.routes.js

@@ -137,4 +137,55 @@ router.post('/refresh-models', authenticateToken, requireAdmin, async (req, res)
   }
 });
 
+/**
+ * POST /api/openrouter/chat
+ * Envoyer un message au modèle IA
+ */
+router.post('/chat', authenticateToken, async (req, res) => {
+  try {
+    const { model, messages } = req.body;
+
+    if (!model || !messages || !Array.isArray(messages)) {
+      return res.status(400).json({ error: 'Modèle et messages requis' });
+    }
+
+    // Récupérer la clé API
+    const setting = await getOne('SELECT value FROM settings WHERE key = ?', ['openrouter_api_key']);
+
+    if (!setting || !setting.value) {
+      return res.status(400).json({ error: 'Clé API OpenRouter non configurée' });
+    }
+
+    // Appeler l'API OpenRouter
+    const fetch = (await import('node-fetch')).default;
+    const response = await fetch('https://openrouter.ai/api/v1/chat/completions', {
+      method: 'POST',
+      headers: {
+        'Authorization': `Bearer ${setting.value}`,
+        'HTTP-Referer': process.env.APP_URL || 'http://localhost:5000',
+        'X-Title': 'NoteFlow',
+        'Content-Type': 'application/json'
+      },
+      body: JSON.stringify({
+        model: model,
+        messages: messages
+      })
+    });
+
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({}));
+      logger.error(`Erreur API OpenRouter chat: ${response.status}`, errorData);
+      return res.status(response.status).json({
+        error: errorData.error?.message || 'Erreur lors de la communication avec l\'IA'
+      });
+    }
+
+    const data = await response.json();
+    res.json(data);
+  } catch (error) {
+    logger.error('Erreur lors du chat OpenRouter:', error);
+    res.status(500).json({ error: 'Erreur serveur' });
+  }
+});
+
 module.exports = router;

src/pages/Index.tsx

@@ -11,10 +11,9 @@ import { Badge } from "@/components/ui/badge";
 import { Label } from "@/components/ui/label";
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
 import { RichTextEditor } from "@/components/RichTextEditor";
-import { MadeWithDyad } from "@/components/made-with-dyad";
 import {
   PlusCircle, Search, User, LogOut, Settings, ChevronDown, Plus, Archive, Trash2,
-  Image as ImageIcon, CheckSquare, FileText, Rss, ExternalLink, RefreshCw, Key, Zap, Paperclip, X, Edit, Calendar as CalendarIcon, Tag as TagIcon
+  Image as ImageIcon, CheckSquare, FileText, Rss, ExternalLink, RefreshCw, Key, Zap, Paperclip, X, Edit, Calendar as CalendarIcon, Tag as TagIcon, MessageSquare, Send
 } from "lucide-react";
 import AuthService from "@/services/AuthService";
 import AdminService from "@/services/AdminService";
@@ -91,8 +90,16 @@ const Index = () => {
   const RSS_MAX_ARTICLES = 14;
   const RSS_PER_PAGE = 7;
 
+  // Chatbox states
+  const [chatOpen, setChatOpen] = useState(false);
+  const [chatMessages, setChatMessages] = useState<Array<{ role: string; content: string }>>([]);
+  const [chatInput, setChatInput] = useState("");
+  const [chatLoading, setChatLoading] = useState(false);
+  const [selectedModel, setSelectedModel] = useState<string>("");
+
   // Debounce timer for auto-save
   const saveTimerRef = useRef<NodeJS.Timeout | null>(null);
+  const chatEndRef = useRef<HTMLDivElement>(null);
 
   // Update current date/time every second
   useEffect(() => {
@@ -491,6 +498,43 @@ const Index = () => {
     }
   };
 
+  const handleSendMessage = async () => {
+    if (!chatInput.trim() || !selectedModel || chatLoading) return;
+
+    const userMessage = { role: 'user', content: chatInput };
+    const newMessages = [...chatMessages, userMessage];
+
+    setChatMessages(newMessages);
+    setChatInput("");
+    setChatLoading(true);
+
+    try {
+      const response = await OpenRouterService.sendMessage(selectedModel, newMessages);
+      setChatMessages([...newMessages, { role: 'assistant', content: response }]);
+    } catch (error: any) {
+      showError(error.message || 'Erreur lors de l\'envoi du message');
+      setChatMessages([...newMessages, { role: 'assistant', content: 'Erreur: ' + error.message }]);
+    } finally {
+      setChatLoading(false);
+    }
+  };
+
+  const handleClearChat = () => {
+    setChatMessages([]);
+  };
+
+  // Scroll to bottom when new message arrives
+  useEffect(() => {
+    chatEndRef.current?.scrollIntoView({ behavior: 'smooth' });
+  }, [chatMessages]);
+
+  // Set default model when models are loaded
+  useEffect(() => {
+    if (openRouterModels.length > 0 && !selectedModel) {
+      setSelectedModel(openRouterModels[0].id);
+    }
+  }, [openRouterModels, selectedModel]);
+
   const confirmAddUser = async (username: string, password: string, isAdmin: boolean) => {
     try {
       const newUser = await AdminService.createUser(username, password, isAdmin);
@@ -2235,9 +2279,123 @@ const Index = () => {
         </DialogContent>
       </Dialog>
 
-      <div className="fixed bottom-4 right-4">
-        <MadeWithDyad />
-      </div>
+      {/* AI Chatbox */}
+      {!chatOpen ? (
+        <Button
+          className="fixed bottom-4 right-4 h-14 w-14 rounded-full shadow-lg"
+          onClick={() => setChatOpen(true)}
+        >
+          <MessageSquare className="h-6 w-6" />
+        </Button>
+      ) : (
+        <Card className="fixed bottom-4 right-4 w-96 h-[600px] shadow-2xl flex flex-col">
+          <CardHeader className="pb-3 border-b">
+            <div className="flex items-center justify-between">
+              <CardTitle className="text-lg flex items-center gap-2">
+                <MessageSquare className="h-5 w-5" />
+                Assistant IA
+              </CardTitle>
+              <div className="flex gap-2">
+                <Button
+                  variant="ghost"
+                  size="sm"
+                  onClick={handleClearChat}
+                  disabled={chatMessages.length === 0}
+                >
+                  <Trash2 className="h-4 w-4" />
+                </Button>
+                <Button
+                  variant="ghost"
+                  size="sm"
+                  onClick={() => setChatOpen(false)}
+                >
+                  <X className="h-4 w-4" />
+                </Button>
+              </div>
+            </div>
+            <div className="mt-2">
+              <select
+                value={selectedModel}
+                onChange={(e) => setSelectedModel(e.target.value)}
+                className="w-full text-xs px-2 py-1.5 border border-input rounded-md bg-background"
+                disabled={chatLoading}
+              >
+                {openRouterModels.length === 0 ? (
+                  <option value="">Aucun modèle disponible</option>
+                ) : (
+                  openRouterModels.map(model => (
+                    <option key={model.id} value={model.id}>
+                      {model.name}
+                    </option>
+                  ))
+                )}
+              </select>
+            </div>
+          </CardHeader>
+
+          <CardContent className="flex-1 overflow-y-auto p-4 space-y-3">
+            {chatMessages.length === 0 ? (
+              <div className="text-center text-muted-foreground text-sm py-8">
+                Commencez une conversation avec l'IA
+              </div>
+            ) : (
+              chatMessages.map((msg, idx) => (
+                <div
+                  key={idx}
+                  className={`flex ${msg.role === 'user' ? 'justify-end' : 'justify-start'}`}
+                >
+                  <div
+                    className={`max-w-[80%] rounded-lg px-3 py-2 text-sm ${
+                      msg.role === 'user'
+                        ? 'bg-primary text-primary-foreground'
+                        : 'bg-muted'
+                    }`}
+                  >
+                    {msg.content}
+                  </div>
+                </div>
+              ))
+            )}
+            {chatLoading && (
+              <div className="flex justify-start">
+                <div className="bg-muted rounded-lg px-3 py-2 text-sm">
+                  <div className="flex gap-1">
+                    <span className="animate-bounce">●</span>
+                    <span className="animate-bounce delay-100">●</span>
+                    <span className="animate-bounce delay-200">●</span>
+                  </div>
+                </div>
+              </div>
+            )}
+            <div ref={chatEndRef} />
+          </CardContent>
+
+          <div className="border-t p-3">
+            <form
+              onSubmit={(e) => {
+                e.preventDefault();
+                handleSendMessage();
+              }}
+              className="flex gap-2"
+            >
+              <Input
+                value={chatInput}
+                onChange={(e) => setChatInput(e.target.value)}
+                placeholder="Posez une question..."
+                disabled={chatLoading || !selectedModel}
+                className="flex-1"
+              />
+              <Button
+                type="submit"
+                size="icon"
+                disabled={chatLoading || !chatInput.trim() || !selectedModel}
+              >
+                <Send className="h-4 w-4" />
+              </Button>
+            </form>
+          </div>
+        </Card>
+      )}
 
       {/* Image modal for fullscreen view */}
       {selectedImage && (

src/services/OpenRouterService.ts

@@ -54,6 +54,33 @@ class OpenRouterService {
       throw error;
     }
   }
+
+  /**
+   * Send chat message to AI model
+   */
+  async sendMessage(model: string, messages: Array<{ role: string; content: string }>): Promise<string> {
+    try {
+      const response = await fetch('/api/openrouter/chat', {
+        method: 'POST',
+        headers: {
+          ...AuthService.getHeaders(),
+          'Content-Type': 'application/json'
+        },
+        body: JSON.stringify({ model, messages })
+      });
+
+      if (!response.ok) {
+        const error = await response.json().catch(() => ({ error: 'Erreur inconnue' }));
+        throw new Error(error.error || 'Erreur lors de la communication avec l\'IA');
+      }
+
+      const data = await response.json();
+      return data.choices?.[0]?.message?.content || 'Pas de réponse';
+    } catch (error: any) {
+      console.error('Erreur lors de l\'envoi du message:', error);
+      throw error;
+    }
+  }
 }
 
 export default new OpenRouterService();