Full app rebuild: FastAPI backend + React Native mobile with auth, championships, admin

Backend (FastAPI + SQLAlchemy + SQLite):
- JWT auth with access/refresh tokens, bcrypt password hashing
- User model with member/organizer/admin roles, auto-approve members
- Championship, Registration, ParticipantList, Notification models
- Alembic async migrations, seed data with test users
- Registration endpoint returns tokens for members, pending for organizers
- /registrations/my returns championship title/date/location via eager loading
- Admin endpoints: list users, approve/reject organizers

Mobile (React Native + Expo + TypeScript):
- Zustand auth store, Axios client with token refresh interceptor
- Role-based registration (Member vs Organizer) with contextual form labels
- Tab navigation with Ionicons, safe area headers, admin tab for admin role
- Championships list with status badges, detail screen with registration progress
- My Registrations with championship title, progress bar, and tap-to-navigate
- Admin panel with pending/all filter, approve/reject with confirmation
- Profile screen with role badge, Ionicons info rows, sign out
- Password visibility toggle (Ionicons), keyboard flow hints (returnKeyType)

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

backend/app/crud/crud_user.py

@@ -0,0 +1,57 @@
+import uuid
+
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.user import User
+from app.schemas.user import UserRegister, UserUpdate
+from app.services.auth_service import hash_password
+
+
+async def get_by_id(db: AsyncSession, user_id: str | uuid.UUID) -> User | None:
+    uid = user_id if isinstance(user_id, uuid.UUID) else uuid.UUID(str(user_id))
+    result = await db.execute(select(User).where(User.id == uid))
+    return result.scalar_one_or_none()
+
+
+async def get_by_email(db: AsyncSession, email: str) -> User | None:
+    result = await db.execute(select(User).where(User.email == email.lower()))
+    return result.scalar_one_or_none()
+
+
+async def create(db: AsyncSession, data: UserRegister) -> User:
+    user = User(
+        email=data.email.lower(),
+        hashed_password=hash_password(data.password),
+        full_name=data.full_name,
+        phone=data.phone,
+        role=data.requested_role,
+        organization_name=data.organization_name,
+        instagram_handle=data.instagram_handle,
+        # Members are auto-approved; organizers require admin review
+        status="approved" if data.requested_role == "member" else "pending",
+    )
+    db.add(user)
+    await db.commit()
+    await db.refresh(user)
+    return user
+
+
+async def update(db: AsyncSession, user: User, data: UserUpdate) -> User:
+    for field, value in data.model_dump(exclude_none=True).items():
+        setattr(user, field, value)
+    await db.commit()
+    await db.refresh(user)
+    return user
+
+
+async def set_status(db: AsyncSession, user: User, status: str) -> User:
+    user.status = status
+    await db.commit()
+    await db.refresh(user)
+    return user
+
+
+async def list_all(db: AsyncSession, skip: int = 0, limit: int = 100) -> list[User]:
+    result = await db.execute(select(User).offset(skip).limit(limit))
+    return list(result.scalars().all())