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/schemas/user.py

@@ -0,0 +1,52 @@
+import uuid
+from datetime import datetime
+from typing import Literal
+
+from pydantic import BaseModel, EmailStr, field_validator
+
+
+class UserRegister(BaseModel):
+    email: EmailStr
+    password: str
+    full_name: str
+    phone: str | None = None
+    # Role requested at registration: 'member' or 'organizer'
+    requested_role: Literal["member", "organizer"] = "member"
+    # Organizer-only fields
+    organization_name: str | None = None
+    instagram_handle: str | None = None
+
+    @field_validator("organization_name")
+    @classmethod
+    def org_name_required_for_organizer(cls, v, info):
+        if info.data.get("requested_role") == "organizer" and not v:
+            raise ValueError("Organization name is required for organizer registration")
+        return v
+
+
+class UserLogin(BaseModel):
+    email: EmailStr
+    password: str
+
+
+class UserOut(BaseModel):
+    model_config = {"from_attributes": True}
+
+    id: uuid.UUID
+    email: str
+    full_name: str
+    phone: str | None
+    role: str
+    status: str
+    organization_name: str | None
+    instagram_handle: str | None
+    expo_push_token: str | None
+    created_at: datetime
+
+
+class UserUpdate(BaseModel):
+    full_name: str | None = None
+    phone: str | None = None
+    organization_name: str | None = None
+    instagram_handle: str | None = None
+    expo_push_token: str | None = None