修复日登录埋点构造器缺失

恢复 TrackingEventDraft::user 用户态构造器

补充用户 scope 与主体字段的回归测试

server-rs/crates/api-server/src/tracking.rs

@@ -61,6 +61,16 @@ impl TrackingEventDraft {
             client_marker: None,
         }
     }
+
+    pub fn user(event_key: &'static str, module_key: &'static str, user_id: &str) -> Self {
+        let normalized_user_id = user_id.trim().to_string();
+        let mut draft = Self::new(event_key, module_key);
+        draft.scope_kind = RuntimeTrackingScopeKind::User;
+        draft.scope_id = normalized_user_id.clone();
+        draft.user_id = Some(normalized_user_id.clone());
+        draft.owner_user_id = Some(normalized_user_id);
+        draft
+    }
 }
 
 #[derive(Clone, Debug)]
@@ -1271,6 +1281,21 @@ mod tests {
         assert_eq!(resolve_tracking_scope_id(&spec, &identity), "user-225");
     }
 
+    #[test]
+    fn user_tracking_draft_sets_user_scope_and_subject_fields() {
+        let draft = TrackingEventDraft::user("daily_login", "profile", " user-225 ");
+
+        assert_eq!(
+            draft.scope_kind,
+            module_runtime::RuntimeTrackingScopeKind::User
+        );
+        assert_eq!(draft.scope_id, "user-225");
+        assert_eq!(draft.user_id.as_deref(), Some("user-225"));
+        assert_eq!(draft.owner_user_id.as_deref(), Some("user-225"));
+        assert_eq!(draft.module_key, Some("profile"));
+        assert_eq!(draft.event_key, "daily_login");
+    }
+
     #[test]
     fn tracking_identity_uses_external_api_owner_and_does_not_forge_user() {
         let authenticated = build_test_authenticated("login-user");