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/routes/auth.rs

@@ -0,0 +1,30 @@
+use axum::{extract::State, Json};
+use serde_json::{json, Value};
+
+use crate::{
+    app::AppState,
+    error::AppResult,
+    models::{club::Club, profile::CreateProfileRequest},
+    seed,
+    services::{club as club_svc, profile as profile_svc},
+};
+
+pub async fn post_auth_local(
+    State(state): State<AppState>,
+    Json(req): Json<CreateProfileRequest>,
+) -> AppResult<Json<Value>> {
+    let username = req.username.unwrap_or_else(|| "Player 1".into());
+
+    let profile = profile_svc::create_profile(&state.pool, &username).await?;
+
+    let club = Club::new(&profile.id, "OpenFUT FC", 5000);
+    club_svc::create_club(&state.pool, &club).await?;
+
+    seed::grant_starter_pack(&state.pool, &club.id, &state.pack_defs).await?;
+
+    Ok(Json(json!({
+        "profile": profile,
+        "club": club,
+        "message": "Welcome to OpenFUT FC! Your club has been created."
+    })))
+}