fix: resolve login issues and auto-seed database

Frontend fixes:
- Fix double /api in API URL (was /api/api/auth/login)
- Smart baseURL detection to avoid duplication

Backend fixes:
- Add auto-seed module to populate database on first startup
- Seed 13 participants and 15 sample challenges automatically
- Check if database is empty before seeding to avoid duplicates

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

backend/app/main.py

@@ -11,7 +11,8 @@ from fastapi.staticfiles import StaticFiles
 from contextlib import asynccontextmanager
 from pathlib import Path
 from app.config import get_settings
-from app.database import init_db, get_db
+from app.database import init_db, get_db, SessionLocal
+from app.seed import auto_seed_if_empty
 from app.routes import (
     auth_router,
     participants_router,
@@ -56,6 +57,13 @@ async def lifespan(app: FastAPI):
     init_db()
     logger.info("Database initialized")
 
+    # Auto-seed database if empty
+    db = SessionLocal()
+    try:
+        auto_seed_if_empty(db)
+    finally:
+        db.close()
+
     # Start pack scheduler
     start_scheduler()
     logger.info("Pack scheduler started")

backend/app/seed.py

@@ -0,0 +1,186 @@
+"""
+Auto-seed module for EVG Ultimate Team.
+
+Automatically seeds the database with initial data if empty.
+"""
+
+from sqlalchemy.orm import Session
+from app.models import Participant, Challenge, ChallengeType, ChallengeStatus
+from app.utils.logger import logger
+
+
+def seed_participants(db: Session) -> None:
+    """Seed the database with all 13 participants."""
+    participants_data = [
+        {"name": "Paul C.", "is_groom": True, "avatar_url": None},
+        {"name": "Clément P.", "is_groom": False, "avatar_url": None},  # Admin
+        {"name": "Paul J.", "is_groom": False, "avatar_url": None},
+        {"name": "Hugo F.", "is_groom": False, "avatar_url": None},
+        {"name": "Théo C.", "is_groom": False, "avatar_url": None},
+        {"name": "Antonin M.", "is_groom": False, "avatar_url": None},
+        {"name": "Philippe C.", "is_groom": False, "avatar_url": None},
+        {"name": "Lancelot M.", "is_groom": False, "avatar_url": None},
+        {"name": "Vianney D.", "is_groom": False, "avatar_url": None},
+        {"name": "Thomas S.", "is_groom": False, "avatar_url": None},
+        {"name": "Martin L.", "is_groom": False, "avatar_url": None},
+        {"name": "Guillaume V.", "is_groom": False, "avatar_url": None},
+        {"name": "Adrien M.", "is_groom": False, "avatar_url": None},
+    ]
+
+    for data in participants_data:
+        participant = Participant(
+            name=data["name"],
+            is_groom=data["is_groom"],
+            avatar_url=data["avatar_url"],
+            total_points=0,
+            current_packs={"bronze": 0, "silver": 0, "gold": 0, "ultimate": 0}
+        )
+        db.add(participant)
+
+    db.commit()
+    logger.info(f"✓ Created {len(participants_data)} participants")
+
+
+def seed_challenges(db: Session) -> None:
+    """Seed the database with sample challenges."""
+    challenges_data = [
+        # Individual Challenges (20-50 pts)
+        {
+            "title": "Convince a stranger you're a Red Bull sales rep",
+            "description": "Approach a stranger and successfully convince them you work for Red Bull. Must last at least 2 minutes.",
+            "type": ChallengeType.INDIVIDUAL,
+            "points": 30,
+            "status": ChallengeStatus.PENDING
+        },
+        {
+            "title": "Win a 1v1 FIFA match against Paul",
+            "description": "Challenge Paul to a FIFA match and win. Best of 3 games.",
+            "type": ChallengeType.INDIVIDUAL,
+            "points": 50,
+            "status": ChallengeStatus.PENDING
+        },
+        {
+            "title": "Complete a rugby transformation",
+            "description": "Score a try in the touch rugby game with proper technique.",
+            "type": ChallengeType.INDIVIDUAL,
+            "points": 40,
+            "status": ChallengeStatus.PENDING
+        },
+        {
+            "title": "Finish first in go-kart racing",
+            "description": "Win the go-kart race against all other participants.",
+            "type": ChallengeType.INDIVIDUAL,
+            "points": 50,
+            "status": ChallengeStatus.PENDING
+        },
+        {
+            "title": "Give a 2-minute speech about why Paul is the best groom",
+            "description": "Deliver an impromptu 2-minute speech praising Paul. Must be heartfelt and entertaining.",
+            "type": ChallengeType.INDIVIDUAL,
+            "points": 35,
+            "status": ChallengeStatus.PENDING
+        },
+        {
+            "title": "Order a shot mimicking Paul's accent",
+            "description": "Successfully order a shot at the bar using Paul's accent. Bartender must not notice.",
+            "type": ChallengeType.INDIVIDUAL,
+            "points": 25,
+            "status": ChallengeStatus.PENDING
+        },
+        {
+            "title": "Pitch an absurd item to a stranger",
+            "description": "Use Paul's commercial skills to pitch a ridiculous product to a stranger (e.g., invisible socks). Must last 2 minutes.",
+            "type": ChallengeType.INDIVIDUAL,
+            "points": 30,
+            "status": ChallengeStatus.PENDING
+        },
+        {
+            "title": "Negotiate a discount at the restaurant",
+            "description": "Successfully negotiate at least a 10% discount on the bill using your charm.",
+            "type": ChallengeType.INDIVIDUAL,
+            "points": 45,
+            "status": ChallengeStatus.PENDING
+        },
+        # Team Challenges (100 pts shared)
+        {
+            "title": "Win the padel tournament",
+            "description": "Your team must win the padel tournament on Saturday afternoon.",
+            "type": ChallengeType.TEAM,
+            "points": 100,
+            "status": ChallengeStatus.PENDING
+        },
+        {
+            "title": "Win the football match",
+            "description": "Your team must win the football match on Saturday afternoon.",
+            "type": ChallengeType.TEAM,
+            "points": 100,
+            "status": ChallengeStatus.PENDING
+        },
+        {
+            "title": "Finish champagne bottle under 5 minutes",
+            "description": "Your team of 4 must finish a full champagne bottle in under 5 minutes.",
+            "type": ChallengeType.TEAM,
+            "points": 100,
+            "status": ChallengeStatus.PENDING
+        },
+        {
+            "title": "Complete a 5-person karaoke",
+            "description": "Get 5 people to perform a full karaoke song together. Must be a classic.",
+            "type": ChallengeType.TEAM,
+            "points": 100,
+            "status": ChallengeStatus.PENDING
+        },
+        # Secret Challenges (50-100 pts)
+        {
+            "title": "Make Paul laugh during dinner",
+            "description": "SECRET: Next person to make Paul genuinely laugh during dinner wins. Admin will reveal this at dinner.",
+            "type": ChallengeType.SECRET,
+            "points": 50,
+            "status": ChallengeStatus.PENDING
+        },
+        {
+            "title": "Spot the reference",
+            "description": "SECRET: First person to notice and mention the hidden Toulouse Stade reference wins.",
+            "type": ChallengeType.SECRET,
+            "points": 75,
+            "status": ChallengeStatus.PENDING
+        },
+        {
+            "title": "Midnight champion",
+            "description": "SECRET: Last person awake on Friday night wins bonus points.",
+            "type": ChallengeType.SECRET,
+            "points": 100,
+            "status": ChallengeStatus.PENDING
+        },
+    ]
+
+    for data in challenges_data:
+        challenge = Challenge(
+            title=data["title"],
+            description=data["description"],
+            type=data["type"],
+            points=data["points"],
+            status=data["status"]
+        )
+        db.add(challenge)
+
+    db.commit()
+    logger.info(f"✓ Created {len(challenges_data)} challenges")
+
+
+def auto_seed_if_empty(db: Session) -> None:
+    """
+    Automatically seed the database if it's empty.
+
+    Called during application startup.
+    """
+    # Check if database is empty (no participants)
+    participant_count = db.query(Participant).count()
+
+    if participant_count == 0:
+        logger.info("Database is empty - auto-seeding with initial data...")
+        seed_participants(db)
+        seed_challenges(db)
+        logger.info("✓ Database auto-seed completed successfully!")
+    else:
+        logger.info(f"Database already contains {participant_count} participants - skipping seed")

frontend/src/services/api.ts

@@ -13,7 +13,7 @@ const API_URL = import.meta.env.VITE_API_URL || 'http://localhost:8000';
  * Axios instance with pre-configured base URL and interceptors.
  */
 const apiClient = axios.create({
-  baseURL: `${API_URL}/api`,
+  baseURL: API_URL.endsWith('/api') ? API_URL : `${API_URL}/api`,
   headers: {
     'Content-Type': 'application/json',
   },