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/squad.rs

@@ -0,0 +1,55 @@
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+#[derive(Debug, Clone, Serialize, Deserialize, sqlx::FromRow)]
+pub struct Squad {
+    pub id: String,
+    pub club_id: String,
+    pub name: String,
+    pub formation: String,
+    pub created_at: String,
+    pub updated_at: String,
+}
+
+impl Squad {
+    pub fn new(
+        club_id: impl Into<String>,
+        name: impl Into<String>,
+        formation: impl Into<String>,
+    ) -> Self {
+        let now = chrono::Utc::now().to_rfc3339();
+        Self {
+            id: Uuid::new_v4().to_string(),
+            club_id: club_id.into(),
+            name: name.into(),
+            formation: formation.into(),
+            created_at: now.clone(),
+            updated_at: now,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, sqlx::FromRow)]
+pub struct SquadPlayer {
+    pub id: String,
+    pub squad_id: String,
+    pub owned_card_id: String,
+    pub position_index: i64,
+    pub is_captain: bool,
+    pub is_on_bench: bool,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct SaveSquadRequest {
+    pub name: Option<String>,
+    pub formation: Option<String>,
+    pub players: Vec<SquadPlayerInput>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct SquadPlayerInput {
+    pub owned_card_id: String,
+    pub position_index: i64,
+    pub is_captain: bool,
+    pub is_on_bench: bool,
+}