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/championship.py

@@ -0,0 +1,73 @@
+import json
+import uuid
+from datetime import datetime
+
+from pydantic import BaseModel, model_validator
+
+
+class ChampionshipCreate(BaseModel):
+    title: str
+    description: str | None = None
+    location: str | None = None
+    event_date: datetime | None = None
+    registration_open_at: datetime | None = None
+    registration_close_at: datetime | None = None
+    form_url: str | None = None
+    entry_fee: float | None = None
+    video_max_duration: int | None = None
+    judges: list[dict] | None = None       # [{name, bio, instagram}]
+    categories: list[str] | None = None
+    status: str = "draft"
+    image_url: str | None = None
+
+
+class ChampionshipUpdate(BaseModel):
+    title: str | None = None
+    description: str | None = None
+    location: str | None = None
+    event_date: datetime | None = None
+    registration_open_at: datetime | None = None
+    registration_close_at: datetime | None = None
+    form_url: str | None = None
+    entry_fee: float | None = None
+    video_max_duration: int | None = None
+    judges: list[dict] | None = None
+    categories: list[str] | None = None
+    status: str | None = None
+    image_url: str | None = None
+
+
+class ChampionshipOut(BaseModel):
+    model_config = {"from_attributes": True}
+
+    id: uuid.UUID
+    title: str
+    description: str | None
+    location: str | None
+    event_date: datetime | None
+    registration_open_at: datetime | None
+    registration_close_at: datetime | None
+    form_url: str | None
+    entry_fee: float | None
+    video_max_duration: int | None
+    judges: list[dict] | None
+    categories: list[str] | None
+    status: str
+    source: str
+    instagram_media_id: str | None
+    image_url: str | None
+    created_at: datetime
+    updated_at: datetime
+
+    @model_validator(mode="before")
+    @classmethod
+    def parse_json_fields(cls, v):
+        # judges and categories are stored as JSON strings in the DB
+        if hasattr(v, "__dict__"):
+            raw_j = getattr(v, "judges", None)
+            raw_c = getattr(v, "categories", None)
+            if isinstance(raw_j, str):
+                v.__dict__["judges"] = json.loads(raw_j)
+            if isinstance(raw_c, str):
+                v.__dict__["categories"] = json.loads(raw_c)
+        return v