feat: Phase 3 — polish & settings complete

Card pool:
- TOTW cards (5): overall 88-92, rarity "totw"
- Hero cards (5): overall 85-88, rarity "hero"
- Icon cards (5): overall 93-95, rarity "icon" (permanent, non-loan)

Packs:
- TOTW Pack (30,000 coins): 5 TOTW cards guaranteed
- Icon Pack (50,000 coins): 3 icon cards guaranteed
- Hero Pack (20,000 coins): 5 hero cards guaranteed

Objectives:
- Milestone objectives (6): win 10/50, score 100/500 goals, 10 SBCs, 25 packs

Formations:
- GET /formations returns 12 valid formation strings

Multiple named squads (#20):
- POST /squad with no squad_id always creates a new squad
- POST /squad with squad_id updates that specific squad
- GET /squads: list all squads for the club (metadata only)
- GET /squads/🆔 squad with players + chemistry
- DELETE /squads/🆔 remove a squad

Per-position goal stats (#41):
- Migration 0003: position_goals table
- POST /matches/result accepts optional goal_positions: ["ST","CAM",...]
- GET /statistics now includes position_goals map

Settings (#44-46):
- GET /settings: { difficulty, preferred_formation } with defaults
- PUT /settings: upsert any key-value combination

Draft mode skeleton (#38):
- GET /draft/squad?difficulty=... returns a randomly generated 11-player squad

Integration tests:
- 9 new tests covering: formations, pack buy/open, SBC submit, settings R/W,
  multiple squads, draft endpoint, goal position tracking, win streak

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

data/cards/totw_sample.json

@@ -0,0 +1,7 @@
+[
+  { "id": "card_totw_001", "name": "Gabriel Monteiro TOTW", "overall": 91, "position": "ST", "nation": "Brazil", "league": "Brasileirao", "club": "Flamengo", "pace": 94, "shooting": 92, "passing": 80, "dribbling": 89, "defending": 44, "physical": 84, "rarity": "totw", "image_path": null },
+  { "id": "card_totw_002", "name": "Antoine Mercier TOTW", "overall": 89, "position": "CM", "nation": "France", "league": "Ligue 1", "club": "Paris Saint-Germain", "pace": 83, "shooting": 81, "passing": 92, "dribbling": 87, "defending": 76, "physical": 78, "rarity": "totw", "image_path": null },
+  { "id": "card_totw_003", "name": "Sven Bauer TOTW", "overall": 90, "position": "CB", "nation": "Germany", "league": "Bundesliga", "club": "Bayer Leverkusen", "pace": 84, "shooting": 47, "passing": 78, "dribbling": 74, "defending": 92, "physical": 91, "rarity": "totw", "image_path": null },
+  { "id": "card_totw_004", "name": "Nicolás Paredes TOTW", "overall": 92, "position": "LW", "nation": "Argentina", "league": "Primera Division", "club": "Boca Juniors", "pace": 95, "shooting": 88, "passing": 84, "dribbling": 93, "defending": 47, "physical": 74, "rarity": "totw", "image_path": null },
+  { "id": "card_totw_005", "name": "Jin-Ho Lee TOTW", "overall": 88, "position": "RW", "nation": "South Korea", "league": "Bundesliga", "club": "RB Leipzig", "pace": 93, "shooting": 84, "passing": 80, "dribbling": 91, "defending": 45, "physical": 68, "rarity": "totw", "image_path": null }
+]