feat: Phase 1 — core game loop complete

New endpoints:
- GET  /cards/:card_id       single card lookup
- POST /packs/buy            purchase pack with coins
- POST /objectives/claim     claim completed objective reward
- GET  /matches              match history (limit/mode query params)
- GET  /sbc/:sbc_id          single SBC lookup

Card pool expanded:
- Bronze: 11 → 30 cards (19 nations)
- Silver: 0 → 20 cards (20 nations)
- Rare Gold: 0 → 10 cards (10 nations)

SBC pool expanded:
- Added 5 new SBCs (tri_nations, silver_to_gold, league_loyalty,
  african_stars, gold_standard)

Infrastructure:
- SQLite WAL mode enabled on pool init
- Foreign key enforcement enabled

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/objectives.rs

@@ -1,10 +1,11 @@
 use axum::{extract::State, Json};
+use serde::Deserialize;
 use serde_json::{json, Value};
 
 use crate::{
     app::AppState,
     error::AppResult,
-    services::{objective as obj_svc, profile as profile_svc},
+    services::{club as club_svc, objective as obj_svc, profile as profile_svc},
 };
 
 pub async fn get_objectives(State(state): State<AppState>) -> AppResult<Json<Value>> {
@@ -13,3 +14,25 @@ pub async fn get_objectives(State(state): State<AppState>) -> AppResult<Json<Val
         obj_svc::get_objectives_with_progress(&state.pool, &profile.id, &state.obj_defs).await?;
     Ok(Json(json!({ "objectives": objectives })))
 }
+
+#[derive(Deserialize)]
+pub struct ClaimRequest {
+    pub objective_id: String,
+}
+
+pub async fn post_claim_objective(
+    State(state): State<AppState>,
+    Json(req): Json<ClaimRequest>,
+) -> AppResult<Json<Value>> {
+    let profile = profile_svc::get_active_profile(&state.pool).await?;
+    let club = club_svc::get_club_by_profile(&state.pool, &profile.id).await?;
+    let reward = obj_svc::claim_objective(
+        &state.pool,
+        &profile.id,
+        &club.id,
+        &state.obj_defs,
+        &req.objective_id,
+    )
+    .await?;
+    Ok(Json(json!({ "claimed": true, "reward": reward })))
+}