improve reasoning toggle tests and refactor model capability checks

src/routes/chats.js

@@ -17,13 +17,15 @@ const messageValidator = (body) => {
 };
 
 const sendMessageValidator = (body) => {
-    const message = String(body?.message || "").trim();
+    const attachments = body?.attachments ?? [];
+    if (!Array.isArray(attachments) || attachments.some(id => typeof id !== "string" || !/^[a-f0-9-]{36}$/.test(id))) return {error: "Invalid attachment IDs"};
+    const message = String(body?.message || "").trim() || (attachments.length ? "Describe the attached images." : "");
     const chatId = Number(body?.chatId);
     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"};
     if (body.reasoning !== undefined && typeof body.reasoning !== "boolean") return {error: "reasoning must be a boolean"};
-    return {value: {message, chatId, model: String(body?.model || "qwen3:14b"), webSearch: body.webSearch === true, reasoning: body.reasoning === true}};
+    return {value: {message, chatId, attachments, model: String(body?.model || "qwen3:14b"), webSearch: body.webSearch === true, reasoning: body.reasoning === true}};
 };
 
 const organizationValidator = (body) => ({
@@ -413,6 +415,7 @@ export function createChatsRouter({repositories, chatService, modelService, conf
                 user: req.session.user,
                 chatId: req.validatedBody.chatId,
                 message: req.validatedBody.message,
+                attachments: req.validatedBody.attachments,
                 model: req.validatedBody.model,
                 webSearch: req.validatedBody.webSearch,
                 reasoning: req.validatedBody.reasoning
@@ -449,6 +452,7 @@ export function createChatsRouter({repositories, chatService, modelService, conf
                 user: req.session.user,
                 chatId: req.validatedBody.chatId,
                 message: req.validatedBody.message,
+                attachments: req.validatedBody.attachments,
                 model: req.validatedBody.model,
                 onChunk: (chunk, fullReply) => sendEvent("chunk", {chunk, fullReply}),
                 onThinking: (chunk, fullThinking) => sendEvent("thinking", {chunk, fullThinking}),