Refactor admin procedures into separate files

Extract admin procedures from router.ts into dedicated files under
procedures/admin/ with consolidated exports via _routes.ts. Adds shared
helper functions for response transformation and includes race condition
fixes via transaction-scoped existence checks.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api-server/src/procedures/admin/orgs/delete.ts

@@ -0,0 +1,36 @@
+/**
+ * admin.orgs.delete - Delete organization and all related records
+ */
+
+import { ORPCError } from "@orpc/server";
+import { authMiddleware, os, superuserMiddleware } from "../../base.js";
+
+export const adminOrgsDelete = os.admin.orgs.delete
+  .use(authMiddleware)
+  .use(superuserMiddleware)
+  .handler(async ({ input, context }) => {
+    const { slug } = input;
+
+    // Delete org and related records in transaction
+    await context.db.transaction().execute(async (trx) => {
+      const org = await trx
+        .selectFrom("orgs")
+        .where("slug", "=", slug)
+        .select(["id"])
+        .executeTakeFirst();
+      if (!org) {
+        throw new ORPCError("NOT_FOUND", { message: "Organization not found" });
+      }
+
+      await trx
+        .deleteFrom("org_invites")
+        .where("org_id", "=", org.id)
+        .execute();
+      await trx.deleteFrom("org_sites").where("org_id", "=", org.id).execute();
+      await trx
+        .deleteFrom("org_members")
+        .where("org_id", "=", org.id)
+        .execute();
+      await trx.deleteFrom("orgs").where("id", "=", org.id).execute();
+    });
+  });