feat: implement database and AI provider configuration settings with Google GenAI integration

src/app/(dashboard)/admin/ai-chat/page.tsx

@@ -145,9 +145,18 @@ function MessageBubble({ msg }: { msg: Message }) {
     );
 }
 
+const GOOGLE_MODELS: ModelInfo[] = [
+    { id: "gemini-2.5-pro-preview-05-06", name: "Gemini 2.5 Pro Preview", free: false, promptPrice: 0, completionPrice: 0 },
+    { id: "gemini-2.0-flash", name: "Gemini 2.0 Flash", free: false, promptPrice: 0, completionPrice: 0 },
+    { id: "gemini-2.0-flash-thinking-exp", name: "Gemini 2.0 Flash Thinking", free: false, promptPrice: 0, completionPrice: 0 },
+    { id: "gemini-1.5-pro", name: "Gemini 1.5 Pro", free: false, promptPrice: 0, completionPrice: 0 },
+    { id: "gemini-1.5-flash", name: "Gemini 1.5 Flash", free: false, promptPrice: 0, completionPrice: 0 },
+];
+
 export default function AdminAiChatPage() {
     const [models, setModels] = useState<ModelInfo[]>([]);
     const [selectedModel, setSelectedModel] = useState<string>(DEFAULT_MODEL);
+    const [aiProvider, setAiProviderState] = useState<"openrouter" | "google">("openrouter");
     const [messages, setMessages] = useState<Message[]>([]);
     const [input, setInput] = useState("");
     const [loading, setLoading] = useState(false);
@@ -161,15 +170,31 @@ export default function AdminAiChatPage() {
 
     const selectedModelInfo = models.find(m => m.id === selectedModel) ?? null;
 
-    // Fetch models
+    // Fetch config + models
     useEffect(() => {
         setLoadingModels(true);
-        fetch("/api/openrouter/models")
+        fetch("/api/admin/ai-config")
             .then(r => r.json())
             .then(d => {
-                if (d.models) setModels(d.models);
+                const provider: "openrouter" | "google" = d.provider ?? "openrouter";
+                setAiProviderState(provider);
+                if (provider === "google") {
+                    setModels(GOOGLE_MODELS);
+                    setSelectedModel(d.googleAiModel ?? "gemini-2.0-flash");
+                } else {
+                    fetch("/api/openrouter/models")
+                        .then(r => r.json())
+                        .then(od => { if (od.models) setModels(od.models); })
+                        .catch(() => { });
+                    if (d.openRouterModel) setSelectedModel(d.openRouterModel);
+                }
+            })
+            .catch(() => {
+                fetch("/api/openrouter/models")
+                    .then(r => r.json())
+                    .then(od => { if (od.models) setModels(od.models); })
+                    .catch(() => { });
             })
-            .catch(() => { })
             .finally(() => setLoadingModels(false));
     }, []);
 
@@ -335,7 +360,14 @@ export default function AdminAiChatPage() {
             {/* Model selector */}
             <div className="mb-4 shrink-0">
                 <div className="flex items-center gap-3 p-3 rounded-xl bg-[var(--bg-elevated)] border border-[var(--border)]">
-                    <span className="text-xs font-medium text-[var(--text-muted)] shrink-0">Modèle</span>
+                    <span className={cn(
+                        "text-[10px] font-semibold px-1.5 py-0.5 rounded shrink-0",
+                        aiProvider === "google"
+                            ? "bg-blue-500/10 text-blue-500"
+                            : "bg-[var(--accent-bg)] text-[var(--accent)]"
+                    )}>
+                        {aiProvider === "google" ? "Google AI" : "OpenRouter"}
+                    </span>
                     {loadingModels ? (
                         <div className="flex items-center gap-2 text-xs text-[var(--text-muted)]">
                             <Loader2 className="w-3.5 h-3.5 animate-spin" />

src/app/(dashboard)/settings/page.tsx

@@ -121,6 +121,12 @@ export default function SettingsPage() {
     const [selectedModel, setSelectedModel] = useState("google/gemini-2.0-flash-001");
     const [modelsStatus, setModelsStatus] = useState<"idle" | "loading" | "ok" | "error">("idle");
 
+    // AI Provider
+    const [aiProvider, setAiProvider] = useState<"openrouter" | "google">("openrouter");
+    const [googleAiKey, setGoogleAiKey] = useState("");
+    const [showGoogleKey, setShowGoogleKey] = useState(false);
+    const [googleAiModel, setGoogleAiModel] = useState("gemini-2.5-pro-preview-05-06");
+
     const [isMounted, setIsMounted] = useState(false);
 
     const {
@@ -171,6 +177,9 @@ export default function SettingsPage() {
             if (config.openRouterModel) {
                 setSelectedModel(config.openRouterModel);
             }
+            if (config.aiProvider) setAiProvider(config.aiProvider);
+            if (config.googleAiKey) setGoogleAiKey(config.googleAiKey);
+            if (config.googleAiModel) setGoogleAiModel(config.googleAiModel);
         }
     }, [fetchModels, setApiKey, setDatabase, setHost, setPassword, setPort, setSelectedModel, setSsl, setUser]);
 
@@ -195,7 +204,7 @@ export default function SettingsPage() {
     const handleSave = async () => {
         setSaveStatus("saving");
         const url = getDatabaseUrl();
-        const res = await saveDatabaseSettings(url, apiKey, selectedModel);
+        const res = await saveDatabaseSettings(url, apiKey, selectedModel, aiProvider, googleAiKey, googleAiModel);
         if (res.success) {
             setSaveStatus("saved");
             setTimeout(() => setSaveStatus("idle"), 2500);
@@ -308,6 +317,65 @@ export default function SettingsPage() {
             {/* API FF Nancy */}
             <FfApiStatusSection />
 
+            {/* AI Provider selector */}
+            <Section title="Admin AI Chat — Fournisseur" subtitle="Choisissez le fournisseur IA utilisé dans l'onglet Admin AI Chat">
+                <div className="flex gap-2">
+                    <button
+                        onClick={() => setAiProvider("openrouter")}
+                        className={`flex-1 py-2.5 px-4 rounded-lg border text-[13px] font-medium transition-colors ${aiProvider === "openrouter" ? "border-[var(--accent)] bg-[var(--accent-bg)] text-[var(--accent)]" : "border-[var(--border)] text-[var(--text-secondary)] hover:bg-[var(--bg-elevated)]"}`}
+                    >
+                        OpenRouter
+                    </button>
+                    <button
+                        onClick={() => setAiProvider("google")}
+                        className={`flex-1 py-2.5 px-4 rounded-lg border text-[13px] font-medium transition-colors ${aiProvider === "google" ? "border-[var(--accent)] bg-[var(--accent-bg)] text-[var(--accent)]" : "border-[var(--border)] text-[var(--text-secondary)] hover:bg-[var(--bg-elevated)]"}`}
+                    >
+                        Google AI Studio
+                    </button>
+                </div>
+
+                {aiProvider === "google" && (
+                    <>
+                        <Field label="Clé API Google AI Studio" hint="Disponible sur aistudio.google.com/apikey — commence par AIza...">
+                            <div className="relative">
+                                <input
+                                    type={showGoogleKey ? "text" : "password"}
+                                    placeholder="AIzaSy..."
+                                    value={googleAiKey}
+                                    onChange={(e) => setGoogleAiKey(e.target.value)}
+                                    className="apple-input font-mono pr-10"
+                                />
+                                <button
+                                    onClick={() => setShowGoogleKey((v) => !v)}
+                                    className="absolute right-3 top-1/2 -translate-y-1/2 opacity-50 hover:opacity-100 transition-opacity"
+                                >
+                                    {showGoogleKey ? <EyeOff className="w-4 h-4" style={{ color: "var(--text-primary)" }} /> : <Eye className="w-4 h-4" style={{ color: "var(--text-primary)" }} />}
+                                </button>
+                            </div>
+                        </Field>
+                        <Field label="Modèle Google" hint="ex: gemini-2.5-pro-preview-05-06, gemini-2.0-flash, gemini-1.5-pro">
+                            <select
+                                value={googleAiModel}
+                                onChange={(e) => setGoogleAiModel(e.target.value)}
+                                className="apple-input"
+                            >
+                                <option value="gemini-2.5-pro-preview-05-06">Gemini 2.5 Pro Preview</option>
+                                <option value="gemini-2.0-flash">Gemini 2.0 Flash</option>
+                                <option value="gemini-2.0-flash-thinking-exp">Gemini 2.0 Flash Thinking</option>
+                                <option value="gemini-1.5-pro">Gemini 1.5 Pro</option>
+                                <option value="gemini-1.5-flash">Gemini 1.5 Flash</option>
+                            </select>
+                        </Field>
+                    </>
+                )}
+
+                {aiProvider === "openrouter" && (
+                    <p className="text-[12px] text-[var(--text-muted)]">
+                        Utilise la clé OpenRouter configurée ci-dessous et le modèle sélectionné.
+                    </p>
+                )}
+            </Section>
+
             {/* OpenRouter */}
             <Section title="IA Copilot — OpenRouter" subtitle="Clé API pour les analyses de gammes par intelligence artificielle">
                 <Field label="Clé API" hint="Disponible sur openrouter.ai/keys — commence par sk-or-...">