Phase 8 (Core): stateful draft, quick-sell, objectives by ID, market listings

Draft v2 — stateful FUT-style pick sessions:
  - POST /draft/start?difficulty=<> — creates session, returns 5
    candidates for GK slot (position order: GK RB CB CB LB CDM CM CAM RW ST LW)
  - POST /draft/sessions/:id/pick { card_id } — validates candidate,
    advances to next position; on last pick grants coins+pack reward
    (avg OVR ≥84 → gold pack + 2000 coins, ≥78 → silver + 1000, else 400)
  - GET /draft/sessions/:id — session state with per-pick cards
  - POST /draft/sessions/:id/abandon — cancel without reward
  - Migration 0005_draft_sessions.sql

Quick-sell:
  - DELETE /collection/:owned_card_id — removes card, credits coins based
    on overall (85+ → 1500, 80-84 → 900, 75-79 → 600, 65-74 → 300, <65 → 150)

Objectives:
  - GET /objectives/:id — single objective with progress
  - POST /objectives/:id/claim — claim reward by URL param (complement to
    existing POST /objectives/claim body-param endpoint)

Market:
  - GET /market/my-listings — active listings posted by current club
  - DELETE /market/listings/:id — cancel a listing, returns card to collection

Tests: 9 new integration tests (37 total, all passing)

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

src/models/draft.rs

@@ -0,0 +1,26 @@
+use serde::{Deserialize, Serialize};
+use sqlx::FromRow;
+
+#[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+pub struct DraftSession {
+    pub id: String,
+    pub profile_id: String,
+    pub difficulty: String,
+    /// JSON-encoded Vec<String> — position labels in pick order
+    pub pick_order: String,
+    /// JSON-encoded Vec<String> — card_ids picked so far
+    pub picks: String,
+    /// JSON-encoded Vec<String> — card_ids offered for the current slot (None if complete/abandoned)
+    pub current_candidates: Option<String>,
+    pub status: String,
+    pub reward_coins: i64,
+    pub reward_pack_id: Option<String>,
+    pub squad_rating: i64,
+    pub started_at: String,
+    pub completed_at: Option<String>,
+}
+
+/// Default 4-3-3 position pick order for a draft.
+pub const DRAFT_PICK_ORDER: &[&str] = &[
+    "GK", "RB", "CB", "CB", "LB", "CDM", "CM", "CAM", "RW", "ST", "LW",
+];

src/models/mod.rs

@@ -1,5 +1,6 @@
 pub mod card;
 pub mod club;
+pub mod draft;
 pub mod event;
 pub mod market;
 pub mod match_result;