Add orgMemberMiddleware for org-scoped procedures

- Add OrgInfo, OrgMembership, OrgMemberContext types to context.ts
- Create org-member.ts middleware that:
  - Chains with authMiddleware
  - Takes input with org slug
  - Looks up org and verifies membership
  - Adds org and membership info to context
- Export from middlewares/index.ts and procedures/base.ts

Also simplify superuserMiddleware to use authMiddleware.concat()

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

apps/api-server/src/procedures/base.ts

@@ -9,15 +9,22 @@ import type {
   APIContext,
   AuthenticatedContext,
   LoginRequestContext,
+  OrgMemberContext,
 } from "../context.js";
 
 // Re-export middlewares and os from the middlewares folder
 export {
   authMiddleware,
   loginRequestMiddleware,
+  orgMemberMiddleware,
   os,
   superuserMiddleware,
 } from "../middlewares/index.js";
 
 // Type exports for use in procedure files
-export type { APIContext, AuthenticatedContext, LoginRequestContext };
+export type {
+  APIContext,
+  AuthenticatedContext,
+  LoginRequestContext,
+  OrgMemberContext,
+};