Add multi AI providers support

Introduce a second AI provider (GPT-OSS-20B) and UI to switch between Pollinations.ai and GPT-OSS, including integration scaffolding and API key handling as a secret. This enables testing the new model without altering core UX.

X-Lovable-Edit-ID: edt-0d2ba6be-027b-4029-9e71-17c272bde735

src/pages/AIChat.tsx

@@ -1,6 +1,6 @@
 import { useState, useRef, useEffect } from 'react';
 import { motion } from 'framer-motion';
-import { Send, Bot, User, Loader2, Trash2, AlertTriangle, Maximize2, Minimize2 } from 'lucide-react';
+import { Send, Bot, User, Loader2, Trash2, AlertTriangle, Maximize2, Minimize2, ChevronDown } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { Textarea } from '@/components/ui/textarea';
 import { ScrollArea } from '@/components/ui/scroll-area';
@@ -8,6 +8,13 @@ import { useSettings } from '@/contexts/SettingsContext';
 import { useToast } from '@/hooks/use-toast';
 import GlitchText from '@/components/GlitchText';
 import MessageContent from '@/components/MessageContent';
+import { AI_PROVIDERS, AIProvider, getProvider } from '@/lib/aiProviders';
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
+} from '@/components/ui/dropdown-menu';
 
 interface Message {
   id: string;
@@ -17,6 +24,7 @@ interface Message {
 }
 
 const STORAGE_KEY = 'ai-chat-history';
+const PROVIDER_KEY = 'ai-chat-provider';
 
 const AIChat = () => {
   const [messages, setMessages] = useState<Message[]>(() => {
@@ -37,6 +45,10 @@ const AIChat = () => {
   const [input, setInput] = useState('');
   const [isLoading, setIsLoading] = useState(false);
   const [isFullscreen, setIsFullscreen] = useState(false);
+  const [selectedProvider, setSelectedProvider] = useState<AIProvider>(() => {
+    const stored = localStorage.getItem(PROVIDER_KEY);
+    return (stored as AIProvider) || 'pollinations';
+  });
   const scrollRef = useRef<HTMLDivElement>(null);
   const { playSound } = useSettings();
   const { toast } = useToast();
@@ -50,6 +62,11 @@ const AIChat = () => {
     }
   }, [messages]);
 
+  // Persist provider selection
+  useEffect(() => {
+    localStorage.setItem(PROVIDER_KEY, selectedProvider);
+  }, [selectedProvider]);
+
   // Exit fullscreen on Escape key
   useEffect(() => {
     const handleEscape = (e: KeyboardEvent) => {
@@ -146,16 +163,23 @@ const AIChat = () => {
       setMessages(prev => [...prev, assistantMessage]);
 
       // Helper function to make API request with retry logic
+      const provider = getProvider(selectedProvider);
       const makeRequest = async (retries = 3, delay = 1000): Promise<Response> => {
         for (let attempt = 1; attempt <= retries; attempt++) {
           try {
-            const response = await fetch('https://text.pollinations.ai/openai', {
+            const headers: Record<string, string> = {
+              'Content-Type': 'application/json',
+            };
+            
+            if (provider.requiresAuth && provider.apiKey) {
+              headers['Authorization'] = `Bearer ${provider.apiKey}`;
+            }
+
+            const response = await fetch(provider.endpoint, {
               method: 'POST',
-              headers: {
-                'Content-Type': 'application/json',
-              },
+              headers,
               body: JSON.stringify({
-                model: 'openai',
+                model: provider.model,
                 messages: [
                   { role: 'system', content: 'You are a helpful AI assistant with a hacker/cyberpunk personality. Keep responses concise and engaging. IMPORTANT: When sharing code examples, ALWAYS wrap them in markdown code blocks with the language specified, like ```python\ncode here\n``` or ```javascript\ncode here\n```. Never show code without proper markdown code block formatting.' },
                   ...chatHistory,
@@ -348,9 +372,40 @@ const AIChat = () => {
         </div>
       </div>
 
-      <p className="text-muted-foreground mb-4 font-pixel text-sm">
-        {'>'} Free AI chat powered by Pollinations.ai - no login required
-      </p>
+      <div className="flex items-center gap-2 mb-4">
+        <span className="text-muted-foreground font-pixel text-sm">{'>'} Model:</span>
+        <DropdownMenu>
+          <DropdownMenuTrigger asChild>
+            <Button
+              variant="ghost"
+              size="sm"
+              className="text-primary hover:bg-primary/20 font-pixel text-sm gap-1"
+            >
+              {getProvider(selectedProvider).name}
+              <ChevronDown className="w-3 h-3" />
+            </Button>
+          </DropdownMenuTrigger>
+          <DropdownMenuContent className="bg-background border-primary/50">
+            {AI_PROVIDERS.map((provider) => (
+              <DropdownMenuItem
+                key={provider.id}
+                onClick={() => {
+                  setSelectedProvider(provider.id);
+                  playSound('click');
+                }}
+                className={`font-pixel text-xs cursor-pointer ${
+                  selectedProvider === provider.id ? 'text-primary' : 'text-foreground'
+                }`}
+              >
+                <div>
+                  <div>{provider.name}</div>
+                  <div className="text-muted-foreground text-[10px]">{provider.description}</div>
+                </div>
+              </DropdownMenuItem>
+            ))}
+          </DropdownMenuContent>
+        </DropdownMenu>
+      </div>
 
       <ScrollArea className="flex-1 border border-primary/30 rounded-lg p-4 mb-4 bg-background/50" ref={scrollRef}>
         {messages.length === 0 ? (