POL-127: Add organizations table and championship ownership

- Create organizations table with Alembic migration (3-phase: create table, migrate data, drop old column)
- Add org_id FK on championships linking to organizations
- Refactor all schemas into one-class-per-file packages (auth, championship, organization, participant, registration, user)
- Update CRUD layer with selectinload for organization relationships
- Update frontend types and components to use nested organization object
- Remove phantom Championship fields (subtitle, venue, accent_color) from frontend

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

backend/app/crud/crud_user.py

@@ -2,7 +2,9 @@ import uuid
 
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import selectinload
 
+from app.models.organization import Organization
 from app.models.user import User
 from app.schemas.user import UserRegister, UserUpdate
 from app.services.auth_service import hash_password
@@ -10,12 +12,16 @@ 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))
+    result = await db.execute(
+        select(User).where(User.id == uid).options(selectinload(User.organization))
+    )
     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()))
+    result = await db.execute(
+        select(User).where(User.email == email.lower()).options(selectinload(User.organization))
+    )
     return result.scalar_one_or_none()
 
 
@@ -25,23 +31,40 @@ async def create(db: AsyncSession, data: UserRegister) -> User:
         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,
+        role=data.requested_role,
         # Members are auto-approved; organizers require admin review
         status="approved" if data.requested_role == "member" else "pending",
     )
     db.add(user)
+    await db.flush()  # get user.id for the FK
+
+    # Create Organization row for organizer registrations
+    if data.requested_role == "organizer" and data.organization_name:
+        org = Organization(
+            user_id=user.id,
+            name=data.organization_name,
+            status="pending",
+            verified=False,
+        )
+        db.add(org)
+
     await db.commit()
-    await db.refresh(user)
+    await db.refresh(user, attribute_names=["organization"])
     return user
 
 
 async def update(db: AsyncSession, user: User, data: UserUpdate) -> User:
-    for field, value in data.model_dump(exclude_none=True).items():
+    user_fields = data.model_dump(exclude_none=True, exclude={"organization_name"})
+    for field, value in user_fields.items():
         setattr(user, field, value)
+
+    # Route org field updates to Organization table
+    if data.organization_name is not None and user.organization:
+        user.organization.name = data.organization_name
+
     await db.commit()
-    await db.refresh(user)
+    await db.refresh(user, attribute_names=["organization"])
     return user
 
 
@@ -53,5 +76,7 @@ async def set_status(db: AsyncSession, user: User, status: str) -> 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))
+    result = await db.execute(
+        select(User).options(selectinload(User.organization)).offset(skip).limit(limit)
+    )
     return list(result.scalars().all())