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/modding/loader.rs

@@ -0,0 +1,24 @@
+use anyhow::{Context, Result};
+use serde::de::DeserializeOwned;
+use std::path::Path;
+
+#[allow(dead_code)]
+/// Generic loader for JSON arrays from a directory.
+pub fn load_json_dir<T: DeserializeOwned>(dir: &Path) -> Result<Vec<T>> {
+    let mut items = Vec::new();
+    if !dir.exists() {
+        return Ok(items);
+    }
+    for entry in std::fs::read_dir(dir).with_context(|| format!("reading dir {dir:?}"))? {
+        let entry = entry?;
+        let path = entry.path();
+        if path.extension().map(|e| e == "json").unwrap_or(false) {
+            let content =
+                std::fs::read_to_string(&path).with_context(|| format!("reading {path:?}"))?;
+            let batch: Vec<T> =
+                serde_json::from_str(&content).with_context(|| format!("parsing {path:?}"))?;
+            items.extend(batch);
+        }
+    }
+    Ok(items)
+}

src/modding/mod.rs

@@ -0,0 +1,4 @@
+//! Modding support: load JSON data files from the data/ directory.
+//! All game content (cards, packs, objectives, SBCs) is data-driven.
+
+pub mod loader;