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/routes/objectives.rs

@@ -1,10 +1,13 @@
-use axum::{extract::State, Json};
+use axum::{
+    extract::{Path, State},
+    Json,
+};
 use serde::Deserialize;
 use serde_json::{json, Value};
 
 use crate::{
     app::AppState,
-    error::AppResult,
+    error::{AppError, AppResult},
     services::{club as club_svc, objective as obj_svc, profile as profile_svc},
 };
 
@@ -15,6 +18,37 @@ pub async fn get_objectives(State(state): State<AppState>) -> AppResult<Json<Val
     Ok(Json(json!({ "objectives": objectives })))
 }
 
+pub async fn get_objective(
+    State(state): State<AppState>,
+    Path(objective_id): Path<String>,
+) -> AppResult<Json<Value>> {
+    let profile = profile_svc::get_active_profile(&state.pool).await?;
+    let all =
+        obj_svc::get_objectives_with_progress(&state.pool, &profile.id, &state.obj_defs).await?;
+    let obj = all
+        .into_iter()
+        .find(|o| o.definition.id == objective_id)
+        .ok_or_else(|| AppError::NotFound(format!("objective '{objective_id}' not found")))?;
+    Ok(Json(json!({ "objective": obj })))
+}
+
+pub async fn post_claim_objective_by_id(
+    State(state): State<AppState>,
+    Path(objective_id): Path<String>,
+) -> 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,
+        &objective_id,
+    )
+    .await?;
+    Ok(Json(json!({ "claimed": true, "reward": reward })))
+}
+
 #[derive(Deserialize)]
 pub struct ClaimRequest {
     pub objective_id: String,