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>

web/src/app/(app)/championships/[id]/page.tsx

@@ -8,7 +8,7 @@ import { RegistrationTimeline } from "@/components/registrations/RegistrationTim
 import { StatusBadge } from "@/components/shared/StatusBadge";
 import { Button } from "@/components/ui/button";
 import { Separator } from "@/components/ui/separator";
-import { MapPin, Building2, Calendar, CreditCard, Film, ExternalLink } from "lucide-react";
+import { MapPin, Calendar, CreditCard, Film, ExternalLink } from "lucide-react";
 
 export default function ChampionshipDetailPage({ params }: { params: Promise<{ id: string }> }) {
   const { id } = use(params);
@@ -54,7 +54,6 @@ export default function ChampionshipDetailPage({ params }: { params: Promise<{ i
       <div className="flex items-start justify-between gap-4">
         <div>
           <h1 className="font-display text-3xl font-bold tracking-wide">{championship.title}</h1>
-          {championship.subtitle && <p className="text-muted-foreground mt-1">{championship.subtitle}</p>}
         </div>
         <StatusBadge status={championship.status} />
       </div>
@@ -67,12 +66,6 @@ export default function ChampionshipDetailPage({ params }: { params: Promise<{ i
             <span className="text-muted-foreground">{championship.location}</span>
           </div>
         )}
-        {championship.venue && (
-          <div className="flex items-center gap-2.5 rounded-xl bg-surface-elevated border border-border/30 px-4 py-3 text-sm">
-            <Building2 size={16} className="text-purple-accent shrink-0" />
-            <span className="text-muted-foreground">{championship.venue}</span>
-          </div>
-        )}
         {eventDate && (
           <div className="flex items-center gap-2.5 rounded-xl bg-surface-elevated border border-border/30 px-4 py-3 text-sm">
             <Calendar size={16} className="text-gold-accent shrink-0" />

web/src/app/(app)/profile/page.tsx

@@ -64,13 +64,13 @@ export default function ProfilePage() {
             <span className="text-sm text-foreground">{user.phone}</span>
           </div>
         )}
-        {user.organization_name && (
+        {user.organization?.name && (
           <div className="flex items-center justify-between py-2">
             <span className="flex items-center gap-2 text-sm text-dim">
               <Building2 size={14} />
               Organization
             </span>
-            <span className="text-sm text-foreground">{user.organization_name}</span>
+            <span className="text-sm text-foreground">{user.organization.name}</span>
           </div>
         )}
         {user.instagram_handle && (

web/src/components/admin/UserCard.tsx

@@ -35,10 +35,10 @@ export function UserCard({ user, onApprove, onReject, isActing }: Props) {
             <span className={`h-2 w-2 rounded-full shrink-0 ${STATUS_DOT[user.status] ?? "bg-dim"}`} />
           </div>
           <p className="text-sm text-muted-foreground">{user.email}</p>
-          {user.organization_name && (
+          {user.organization?.name && (
             <p className="flex items-center gap-1.5 text-sm text-muted-foreground">
               <Building2 size={12} className="text-dim" />
-              {user.organization_name}
+              {user.organization.name}
             </p>
           )}
           {user.phone && (

web/src/lib/api/auth.ts

@@ -27,6 +27,6 @@ export const authApi = {
 
   me: () => apiClient.get<UserOut>("/auth/me").then((r) => r.data),
 
-  updateMe: (data: Partial<Pick<UserOut, "full_name" | "phone" | "organization_name" | "instagram_handle">>) =>
+  updateMe: (data: Partial<Pick<UserOut, "full_name" | "phone" | "instagram_handle">> & { organization_name?: string }) =>
     apiClient.patch<UserOut>("/auth/me", data).then((r) => r.data),
 };

web/src/types/championship.ts

@@ -1,10 +1,16 @@
+export interface OrganizationBrief {
+  id: string;
+  name: string;
+  instagram: string | null;
+  logo_url: string | null;
+}
+
 export interface Championship {
   id: string;
+  org_id: string | null;
   title: string;
-  subtitle: string | null;
   description: string | null;
   location: string | null;
-  venue: string | null;
   event_date: string | null;
   registration_open_at: string | null;
   registration_close_at: string | null;
@@ -14,7 +20,7 @@ export interface Championship {
   status: "draft" | "open" | "closed" | "completed";
   source: string;
   image_url: string | null;
-  accent_color: string | null;
+  organization: OrganizationBrief | null;
   created_at: string;
   updated_at: string;
 }

web/src/types/user.ts

@@ -1,3 +1,14 @@
+export interface OrganizationOut {
+  id: string;
+  name: string;
+  instagram: string | null;
+  email: string | null;
+  city: string | null;
+  logo_url: string | null;
+  verified: boolean;
+  status: string;
+}
+
 export interface UserOut {
   id: string;
   email: string;
@@ -5,7 +16,7 @@ export interface UserOut {
   phone: string | null;
   role: "member" | "organizer" | "admin";
   status: "pending" | "approved" | "rejected";
-  organization_name: string | null;
   instagram_handle: string | null;
+  organization: OrganizationOut | null;
   created_at: string;
 }