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>

src/models/card.rs

@@ -0,0 +1,45 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum Rarity {
+    #[default]
+    Bronze,
+    Silver,
+    Gold,
+    RareGold,
+    Totw,
+    Hero,
+    Icon,
+}
+
+/// A card definition loaded from JSON data files.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CardDefinition {
+    pub id: String,
+    pub name: String,
+    pub overall: u8,
+    pub position: String,
+    pub nation: String,
+    pub league: String,
+    pub club: String,
+    pub pace: u8,
+    pub shooting: u8,
+    pub passing: u8,
+    pub dribbling: u8,
+    pub defending: u8,
+    pub physical: u8,
+    pub rarity: Rarity,
+    pub image_path: Option<String>,
+}
+
+/// A card instance owned by a club (stored in DB).
+#[derive(Debug, Clone, Serialize, Deserialize, sqlx::FromRow)]
+pub struct OwnedCard {
+    pub id: String,
+    pub club_id: String,
+    pub card_id: String,
+    pub is_loan: bool,
+    pub loan_matches_remaining: Option<i64>,
+    pub acquired_at: String,
+}