Initial commit: OpenFUT Core

Offline Ultimate Team backend — game-independent REST API.

- 19 API endpoints: auth, profiles, clubs, cards, packs, squads,
  objectives, SBCs, match rewards, NPC market, statistics
- Axum + SQLite + SQLx with full migrations
- Weighted pack generator, SBC validation engine
- JSON-driven mod data (cards, packs, objectives, SBCs)
- 5 integration tests passing

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

data/packs/pack_definitions.json

@@ -0,0 +1,64 @@
+[
+  {
+    "id": "bronze_pack",
+    "name": "Bronze Pack",
+    "description": "Contains 12 bronze players.",
+    "cost_coins": 400,
+    "slots": [
+      {
+        "count": 12,
+        "min_overall": null,
+        "rarity_filter": ["bronze"],
+        "guaranteed_rare": false
+      }
+    ]
+  },
+  {
+    "id": "silver_pack",
+    "name": "Silver Pack",
+    "description": "Contains 12 silver players.",
+    "cost_coins": 2500,
+    "slots": [
+      {
+        "count": 12,
+        "min_overall": 65,
+        "rarity_filter": null,
+        "guaranteed_rare": false
+      }
+    ]
+  },
+  {
+    "id": "gold_pack",
+    "name": "Gold Pack",
+    "description": "Contains 12 gold players, at least one rare.",
+    "cost_coins": 7500,
+    "slots": [
+      {
+        "count": 11,
+        "min_overall": 75,
+        "rarity_filter": ["gold"],
+        "guaranteed_rare": false
+      },
+      {
+        "count": 1,
+        "min_overall": 75,
+        "rarity_filter": ["raregold"],
+        "guaranteed_rare": true
+      }
+    ]
+  },
+  {
+    "id": "rare_gold_pack",
+    "name": "Rare Gold Pack",
+    "description": "Contains 12 rare gold players.",
+    "cost_coins": 15000,
+    "slots": [
+      {
+        "count": 12,
+        "min_overall": 75,
+        "rarity_filter": ["raregold"],
+        "guaranteed_rare": true
+      }
+    ]
+  }
+]