update default model to qwen3:14b across routes, services, and frontend components

src/routes/chats.js

@@ -22,7 +22,7 @@ const sendMessageValidator = (body) => {
     if (!chatId) return {error: "chatId is required"};
     if (!message) return {error: "message is required"};
     if (body.webSearch !== undefined && typeof body.webSearch !== "boolean") return {error: "webSearch must be a boolean"};
-    return {value: {message, chatId, model: String(body?.model || "mistral:latest"), webSearch: body.webSearch === true}};
+    return {value: {message, chatId, model: String(body?.model || "qwen3:14b"), webSearch: body.webSearch === true}};
 };
 
 const organizationValidator = (body) => ({
@@ -478,7 +478,7 @@ export function createChatsRouter({repositories, chatService, modelService, conf
             const result = await chatService.retryMessage({
                 user: req.session.user,
                 chatId,
-                selectedModel: String(req.body?.model || "mistral:latest"),
+                selectedModel: String(req.body?.model || "qwen3:14b"),
                 targetMessage,
                 retryStyle: String(req.body?.style || "").trim() || null
             });
@@ -502,7 +502,7 @@ export function createChatsRouter({repositories, chatService, modelService, conf
             const result = await chatService.retryMessage({
                 user: req.session.user,
                 chatId,
-                selectedModel: String(req.body?.model || "mistral:latest"),
+                selectedModel: String(req.body?.model || "qwen3:14b"),
                 targetMessage,
                 retryStyle: String(req.body?.style || "").trim() || null
             });

src/routes/personas.js

@@ -21,7 +21,7 @@ const roleplayStartValidator = (body) => {
             assistantPersonaId,
             userPersonaId: body?.userPersonaId ? Number(body.userPersonaId) : null,
             scenarioPrompt: normalizeOptionalText(body?.scenarioPrompt),
-            model: String(body?.model || "mistral:latest")
+            model: String(body?.model || "qwen3:14b")
         }
     };
 };
@@ -255,7 +255,7 @@ export function createPersonasRouter({repositories, chatService, modelService, c
         chat = repositories.getChat(chat.id, user);
         try {
             const opener = await chatService.generateRoleplayOpener({
-                selectedModel: "mistral:latest",
+                selectedModel: "qwen3:14b",
                 assistantPersona: persona,
                 userPersona,
                 scenarioPrompt,

src/services/chatService.js

@@ -69,7 +69,7 @@ export function createChatService(repositories, modelService, config, webSearchP
     };
 
     const getGenerationSettings = (session, requestedModel) => ({
-        model: requestedModel || session.preferred_model || "mistral:latest",
+        model: requestedModel || session.preferred_model || "qwen3:14b",
         generation: {
             temperature: session.temperature ?? undefined,
             contextLength: session.context_length ?? undefined,
@@ -168,7 +168,7 @@ export function createChatService(repositories, modelService, config, webSearchP
         return repositories.createChat(user, persona.name, persona.id, userPersonaId, scenarioPrompt, scenarioSummary);
     };
 
-    const generateRoleplayOpener = async ({selectedModel = "mistral:latest", assistantPersona, userPersona, scenarioPrompt, sceneSummary}) => {
+    const generateRoleplayOpener = async ({selectedModel = "qwen3:14b", assistantPersona, userPersona, scenarioPrompt, sceneSummary}) => {
         const baseMessages = [
             {role: "system", content: buildPersonaPrompt(assistantPersona)},
             ...(userPersona ? [{role: "system", content: buildUserPersonaPrompt(userPersona)}] : []),