feat(import-fifa17): seed unopenedPackIds as Core entitlements

Carry unopenedPackIds through the importer: Profile model -> Report ->
ApplyPlan. GenericImportRequest now emits entitlements[] (one definition_id
per unopened pack instance, order+duplicates preserved), which Core's import
seeds as unconsumed packs rows in the same transaction. Closes the economy
import gap so a migrated profile's unopened packs become Core entitlements
(feeding purchasegroup/credits/userMassInfo). Idempotency unchanged (import
fingerprint). +1 test; 26 pass, clippy -D warnings clean.

openfut-import-fifa17/src/model.rs

@@ -26,6 +26,10 @@ pub struct Profile {
     pub items: Vec<Item>,
     #[serde(default)]
     pub squads: Vec<Squad>,
+    /// Unconsumed pack entitlements (`unopenedPackIds`), seeded into Core as
+    /// generic entitlements on import.
+    #[serde(rename = "unopenedPackIds", default)]
+    pub unopened_pack_ids: Vec<i64>,
 }
 
 impl Profile {