POL-126: Fix critical backend bugs — Championship model/DB mismatch, broken imports

- Restore judges/categories TEXT columns to Championship model (were in DB but missing from model)
- Remove phantom columns not in DB: org_id, subtitle, venue, accent_color
- Remove broken relationships to unmigrated tables (Organization, Discipline, Style, Fee, Rule, Judge)
- Remove broken instagram_service import from lifespan (file doesn't exist)
- Add http://localhost:3000 to default CORS origins (web frontend)

Model files for unmigrated tables kept on disk for future migration.

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

backend/app/models/__init__.py

@@ -1,26 +1,14 @@
 from app.models.user import User, RefreshToken
-from app.models.organization import Organization
 from app.models.championship import Championship
 from app.models.registration import Registration
 from app.models.participant import ParticipantList
 from app.models.notification import NotificationLog
-from app.models.discipline import Discipline
-from app.models.style import Style
-from app.models.fee import Fee
-from app.models.rule import Rule
-from app.models.judge import Judge
 
 __all__ = [
     "User",
     "RefreshToken",
-    "Organization",
     "Championship",
     "Registration",
     "ParticipantList",
     "NotificationLog",
-    "Discipline",
-    "Style",
-    "Fee",
-    "Rule",
-    "Judge",
 ]

backend/app/models/championship.py

@@ -1,7 +1,7 @@
 import uuid
 from datetime import datetime
 
-from sqlalchemy import DateTime, Float, ForeignKey, Integer, String, Text, Uuid, func
+from sqlalchemy import DateTime, Float, Integer, String, Text, Uuid, func
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.database import Base
@@ -11,21 +11,18 @@ class Championship(Base):
     __tablename__ = "championships"
 
     id: Mapped[uuid.UUID] = mapped_column(Uuid(as_uuid=True), primary_key=True, default=uuid.uuid4)
-    org_id: Mapped[uuid.UUID | None] = mapped_column(Uuid(as_uuid=True), ForeignKey("organizations.id", ondelete="SET NULL"))
     title: Mapped[str] = mapped_column(String(255), nullable=False)
-    subtitle: Mapped[str | None] = mapped_column(String(255))
     description: Mapped[str | None] = mapped_column(Text)
     location: Mapped[str | None] = mapped_column(String(500))
-    venue: Mapped[str | None] = mapped_column(String(255))
     event_date: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
     registration_open_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
     registration_close_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
-    accent_color: Mapped[str | None] = mapped_column(String(20))  # hex color e.g. #FF5CA8
 
-    # Legacy flat fields (kept for backwards compat, replaced by relational tables in POL-7 to POL-11)
     form_url: Mapped[str | None] = mapped_column(String(2048))
     entry_fee: Mapped[float | None] = mapped_column(Float)
     video_max_duration: Mapped[int | None] = mapped_column(Integer)  # seconds
+    judges: Mapped[str | None] = mapped_column(Text)       # JSON string: [{name, bio, instagram}]
+    categories: Mapped[str | None] = mapped_column(Text)   # JSON string: ["cat1", "cat2"]
 
     # Status: 'draft' | 'open' | 'closed' | 'completed'
     status: Mapped[str] = mapped_column(String(20), nullable=False, default="draft")
@@ -40,11 +37,5 @@ class Championship(Base):
         DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
     )
 
-    organization: Mapped["Organization | None"] = relationship(back_populates="championships")  # type: ignore[name-defined]
     registrations: Mapped[list["Registration"]] = relationship(back_populates="championship", cascade="all, delete-orphan")  # type: ignore[name-defined]
     participant_list: Mapped["ParticipantList | None"] = relationship(back_populates="championship", uselist=False, cascade="all, delete-orphan")  # type: ignore[name-defined]
-    disciplines: Mapped[list["Discipline"]] = relationship(back_populates="championship", cascade="all, delete-orphan")  # type: ignore[name-defined]
-    styles: Mapped[list["Style"]] = relationship(back_populates="championship", cascade="all, delete-orphan")  # type: ignore[name-defined]
-    fees: Mapped["Fee | None"] = relationship(back_populates="championship", uselist=False, cascade="all, delete-orphan")  # type: ignore[name-defined]
-    rules: Mapped[list["Rule"]] = relationship(back_populates="championship", cascade="all, delete-orphan")  # type: ignore[name-defined]
-    judges_list: Mapped[list["Judge"]] = relationship(back_populates="championship", cascade="all, delete-orphan")  # type: ignore[name-defined]

backend/app/models/user.py

@@ -30,7 +30,6 @@ class User(Base):
     refresh_tokens: Mapped[list["RefreshToken"]] = relationship(back_populates="user", cascade="all, delete-orphan")
     registrations: Mapped[list["Registration"]] = relationship(back_populates="user")  # type: ignore[name-defined]
     notification_logs: Mapped[list["NotificationLog"]] = relationship(back_populates="user")  # type: ignore[name-defined]
-    organization: Mapped["Organization | None"] = relationship(back_populates="user", uselist=False)  # type: ignore[name-defined]
 
 
 class RefreshToken(Base):