Forward real client IP in device.ip to PBS

Without this, PBS infers the IP from the incoming connection which is
a Fastly edge/data-center IP. Bidders like PubMatic filter data-center
IPs as non-human traffic, resulting in 0% fill through Trusted Server.
The client IP is already available via get_client_ip_addr() and stored
in DeviceInfo.ip — it just wasn't being passed through to the OpenRTB
Device object.

Author: ChristianPavilonis

crates/common/src/integrations/prebid.rs

@@ -579,9 +579,13 @@ impl PrebidAuctionProvider {
             }),
         });
 
-        // Build device object with user-agent and geo if available
+        // Build device object with user-agent, client IP, and geo if available.
+        // Forwarding the real client IP is critical: without it PBS infers the
+        // IP from the incoming connection (a data-center / edge IP), causing
+        // bidders like PubMatic to filter the traffic as non-human.
         let device = request.device.as_ref().map(|d| Device {
             ua: d.user_agent.clone(),
+            ip: d.ip.clone(),
             geo: d.geo.as_ref().map(|geo| Geo {
                 geo_type: 2, // IP address per OpenRTB spec
                 country: Some(geo.country.clone()),

crates/common/src/openrtb.rs

@@ -71,6 +71,8 @@ pub struct Device {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub ua: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
+    pub ip: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub geo: Option<Geo>,
 }