feat: add organization context model

Introduce organizations as the top-level workspace model with address and bank-detail fields.

Store the active organization on Better Auth sessions and load organization context for dashboard routes.

Add the migration that creates organizations and backfills existing records to the default organization.

src/lib/server/organizations.ts

@@ -0,0 +1,94 @@
+import { asc, eq, isNull } from 'drizzle-orm';
+import { db } from '$lib/server/db';
+import { organizations, session } from '$lib/server/db/schema';
+
+const DEFAULT_ORGANIZATION_ID = 'default-organization';
+
+type SessionWithOrganization = {
+	id: string;
+	activeOrganizationId?: string | null;
+};
+
+export async function loadOrganizationContext(locals: App.Locals) {
+	const rows = await db
+		.select()
+		.from(organizations)
+		.where(isNull(organizations.archivedAt))
+		.orderBy(asc(organizations.name));
+
+	if (rows.length === 0) {
+		const now = new Date();
+
+		await db.insert(organizations).values({
+			id: DEFAULT_ORGANIZATION_ID,
+			name: 'Steel City Stadium',
+			workspace: 'Blueprint Workspace',
+			createdAt: now,
+			updatedAt: now
+		});
+
+		rows.push({
+			id: DEFAULT_ORGANIZATION_ID,
+			name: 'Steel City Stadium',
+			workspace: 'Blueprint Workspace',
+			addressLine1: null,
+			addressLine2: null,
+			city: null,
+			region: null,
+			postcode: null,
+			country: 'United Kingdom',
+			bankName: null,
+			bankAccountName: null,
+			bankAccountNumber: null,
+			bankSortCode: null,
+			bankIban: null,
+			bankSwift: null,
+			createdAt: now,
+			updatedAt: now,
+			archivedAt: null
+		});
+	}
+
+	const currentSession = locals.session as SessionWithOrganization | undefined;
+	const activeOrganization =
+		rows.find((organization) => organization.id === currentSession?.activeOrganizationId) ??
+		rows[0];
+
+	if (currentSession && currentSession.activeOrganizationId !== activeOrganization.id) {
+		await db
+			.update(session)
+			.set({ activeOrganizationId: activeOrganization.id, updatedAt: new Date() })
+			.where(eq(session.id, currentSession.id));
+
+		currentSession.activeOrganizationId = activeOrganization.id;
+	}
+
+	return {
+		organizations: rows,
+		activeOrganization,
+		activeOrganizationId: activeOrganization.id
+	};
+}
+
+export async function setActiveOrganization(locals: App.Locals, organizationId: string) {
+	const [organization] = await db
+		.select()
+		.from(organizations)
+		.where(eq(organizations.id, organizationId))
+		.limit(1);
+
+	const currentSession = locals.session as SessionWithOrganization | undefined;
+
+	if (!organization || organization.archivedAt || !currentSession) {
+		return null;
+	}
+
+	await db
+		.update(session)
+		.set({ activeOrganizationId: organization.id, updatedAt: new Date() })
+		.where(eq(session.id, currentSession.id));
+
+	currentSession.activeOrganizationId = organization.id;
+
+	return organization;
+}