feat(fifa17): own FUT hub tile counts in Rust

Migrate GET /hub from the Python proxy to a Rust handler deriving counts from
authoritative state: clubPlayers = owned PLAYER cards in Core (consumables/staff
excluded via catalog kind; may be lower than Python's profile count by the
deferred Legend instances = DIFFERENT-BY-DESIGN), auction/tradePile counts from
the durable market store via the async bridge. Fail-closed 503 on Core error;
market read failure degrades cosmetic counts to 0. Adds classify arm, handler,
ownership + integration tests; reachability tool marks hub migrated.

scripts/openfut-reachability.py

@@ -40,14 +40,14 @@ MIGRATED_NON_ECONOMY = {
     "leaderboards/options",
     "match/reset",
     "phishing",  # phishing/{trusteddevice,question,validate}
+    "hub",
 }
 
 # Documented residual Python-owned non-economy domains (expected > 0 until
 # migrated). Keep in sync with docs/PRODUCTION_AUTHORITY_MATRIX.md.
 RESIDUAL_PYTHON = {
     "openfut/account/sync",
-    "hub",
-    "club/stats",
+    "club/stats",  # year/consumables still Python; club/stats/staff is Rust
     "clientdata/userHubData",
 }