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/sbc.rs

@@ -0,0 +1,59 @@
+use serde::{Deserialize, Serialize};
+
+/// SBC definition from data/sbcs/*.json
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SbcDefinition {
+    pub id: String,
+    pub name: String,
+    pub description: String,
+    pub requirements: SbcRequirements,
+    pub reward: SbcReward,
+    pub expires_at: Option<String>,
+    pub repeatable: bool,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SbcRequirements {
+    pub squad_size: u8,
+    pub min_overall: Option<u8>,
+    pub max_overall: Option<u8>,
+    pub min_chemistry: Option<u8>,
+    pub required_leagues: Vec<String>,
+    pub required_nations: Vec<String>,
+    pub required_clubs: Vec<String>,
+    pub min_players_from_same_league: Option<u8>,
+    pub min_players_from_same_nation: Option<u8>,
+    pub min_players_from_same_club: Option<u8>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SbcReward {
+    pub coins: i64,
+    pub xp: i64,
+    pub pack_id: Option<String>,
+}
+
+/// DB record of a completed submission
+#[allow(dead_code)]
+#[derive(Debug, Clone, Serialize, Deserialize, sqlx::FromRow)]
+pub struct SbcSubmission {
+    pub id: String,
+    pub profile_id: String,
+    pub sbc_id: String,
+    pub submitted_card_ids: String,
+    pub passed: bool,
+    pub submitted_at: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct SubmitSbcRequest {
+    pub sbc_id: String,
+    pub owned_card_ids: Vec<String>,
+}
+
+#[derive(Debug, Serialize)]
+pub struct SbcResult {
+    pub passed: bool,
+    pub failures: Vec<String>,
+    pub reward: Option<SbcReward>,
+}