modify: Update AI assistant branding to DeepSeek AI

Replaced references to Google Gemini with DeepSeek AI in user messages, error handling, and UI text to reflect the change in AI provider. Updated environment variable instructions accordingly.

Author: DongDuong2001

app/dashboard/ai-tools/page.tsx

@@ -24,7 +24,7 @@ export default function AIToolsPage() {
       {
         role: "assistant",
         content:
-          "Hello! I'm your AI development assistant powered by Google Gemini. I can help you with code generation, debugging, architecture decisions, and more. What would you like to work on today?",
+          "Hello! I'm your AI development assistant powered by DeepSeek AI. I can help you with code generation, debugging, architecture decisions, and more. What would you like to work on today?",
         timestamp: new Date().toLocaleTimeString(),
       },
     ])
@@ -73,11 +73,11 @@ export default function AIToolsPage() {
 
       setMessages((prev) => [...prev, aiMessage])
     } catch (error) {
-      console.error("Error calling Gemini API:", error)
+      console.error("Error calling AI API:", error)
       const errorMessage: Message = {
         role: "assistant",
         content:
-          "Sorry, I encountered an error. Please make sure you have set up your Google Gemini API key in the environment variables (GEMINI_API_KEY).",
+          "Sorry, I encountered an error. Please make sure you have set up your DeepSeek API key in the environment variables (DEEPSEEK_API_KEY).",
         timestamp: new Date().toLocaleTimeString(),
       }
       setMessages((prev) => [...prev, errorMessage])
@@ -94,7 +94,7 @@ export default function AIToolsPage() {
           <Sparkles className="h-8 w-8 text-primary" />
           <div>
             <h1 className="text-4xl font-bold">{t.nav.aiTools}</h1>
-            <p className="text-muted-foreground">Your intelligent development assistant powered by Google Gemini</p>
+            <p className="text-muted-foreground">Your intelligent development assistant powered by DeepSeek AI</p>
           </div>
         </div>
       </div>
@@ -152,7 +152,7 @@ export default function AIToolsPage() {
             </Button>
           </div>
           <p className="text-xs text-muted-foreground mt-2">
-            Powered by Google Gemini AI. Responses are generated in real-time.
+            Powered by DeepSeek AI. Responses are generated in real-time.
           </p>
         </div>
       </div>