feat(fifa17): own club/stats/staff (empty stat set) in Rust

Migrate GET club/stats/staff from the Python proxy to a Rust static handler.
The production oracle returns {} for the staff-bonus stat set (deliberately
empty); the Rust host now owns it (owner=RUST route=club-stats-staff). Updates
classify(), the pre-existing near-miss test (now club/stats/year), the ownership
matrix test, and the no-fallback integration test. club/stats/{year,consumables}
remain Python (aggregation) pending the Core-derived club-stats migration.

openfut-utas-host/tests/host_test.rs

@@ -1377,6 +1377,11 @@ fn non_economy_routes_rust_owned_no_python_no_core() {
             serde_json::json!({}),
         ),
         ("PUT", "/ut/game/fifa17/match/reset", serde_json::json!({})),
+        (
+            "GET",
+            "/ut/game/fifa17/club/stats/staff",
+            serde_json::json!({}),
+        ),
     ];
     for (m, p, want) in cases {
         let resp = server.handle(m, p, &[], b"");