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/db.rs

@@ -0,0 +1,20 @@
+use anyhow::Result;
+use sqlx::{sqlite::SqlitePoolOptions, SqlitePool};
+use tracing::info;
+
+pub type Pool = SqlitePool;
+
+pub async fn init_pool(database_url: &str) -> Result<Pool> {
+    info!("Connecting to database: {}", database_url);
+    let pool = SqlitePoolOptions::new()
+        .max_connections(5)
+        .connect(database_url)
+        .await?;
+    Ok(pool)
+}
+
+pub async fn run_migrations(pool: &Pool) -> Result<()> {
+    info!("Running database migrations");
+    sqlx::migrate!("./migrations").run(pool).await?;
+    Ok(())
+}