feat(popup): add email capture popup with Mautic integration

- Email capture popup with scroll (10%) and exit intent triggers
- First name field and full tracking (UTM, device, time on page)
- Mautic API integration for contact creation
- GeoIP detection for country/region
- 4 locale support (sr, en, de, fr)
- Mautic tracking script in layout

src/app/api/geoip/route.ts

@@ -0,0 +1,67 @@
+import { NextRequest, NextResponse } from "next/server";
+
+export async function GET(request: NextRequest) {
+  try {
+    // Check for Cloudflare's IP header first (production)
+    const cfConnectingIp = request.headers.get("cf-connecting-ip");
+    const forwardedFor = request.headers.get("x-forwarded-for");
+    const realIP = request.headers.get("x-real-ip");
+    
+    // Use Cloudflare IP first, then fall back to other headers
+    let ip = cfConnectingIp || forwardedFor?.split(",")[0]?.trim() || realIP || "127.0.0.1";
+    
+    // For local development, return XX as country code (Mautic accepts this)
+    if (ip === "127.0.0.1" || ip === "::1" || ip.startsWith("192.168.") || ip.startsWith("10.")) {
+      console.log("[GeoIP] Local/private IP detected:", ip);
+      return NextResponse.json({
+        country: "Unknown",
+        countryCode: "XX",
+        region: "",
+        city: "",
+        timezone: "",
+      });
+    }
+    
+    const response = await fetch(`http://ip-api.com/json/${ip}?fields=status,message,country,countryCode,region,regionName,city,timezone`, {
+      headers: {
+        "Accept": "application/json",
+      },
+    });
+
+    if (!response.ok) {
+      throw new Error("GeoIP lookup failed");
+    }
+
+    const data = await response.json();
+    
+    if (data.status !== "success") {
+      console.error("[GeoIP] API error:", data.message, "for IP:", ip);
+      return NextResponse.json({
+        country: "Unknown",
+        countryCode: "XX",
+        region: "",
+        city: "",
+        timezone: "",
+      });
+    }
+
+    console.log("[GeoIP] Success:", data.country, "(" + data.countryCode + ")");
+    
+    return NextResponse.json({
+      country: data.country,
+      countryCode: data.countryCode,
+      region: data.regionName,
+      city: data.city,
+      timezone: data.timezone,
+    });
+  } catch (error) {
+    console.error("[GeoIP] Error:", error);
+    return NextResponse.json({
+      country: "Unknown",
+      countryCode: "XX",
+      region: "",
+      city: "",
+      timezone: "",
+    });
+  }
+}