Add comprehensive e2e tests for API procedures with 100% coverage

- Add admin.test.ts: Tests for superuser operations (users, orgs, sites)
- Add orgs.test.ts: Tests for org management, members, invites, sites
- Expand me.test.ts: Add API tokens, invites, authMiddleware error paths
- Expand auth.test.ts: Add loginRequestMiddleware tests, weak password test fix

Bug fixes:
- Fix countOwners() in orgs/helpers.ts to convert PostgreSQL bigint to number
- Fix signup race condition by handling unique constraint violations gracefully

All 283 tests pass with 100% function coverage on procedures.

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

db/schema.sql

@@ -1,4 +1,4 @@
-\restrict F9AizESreuRieL4inRcHWWg3hyNET0FgnBDFBBBU3cZGPEpHjb591l8S2iglpap
+\restrict ib0L1tt0kcihJbP9aADEOXJtCsMf5T4lIJeG6jvjTT1gyQCoWtfbB5Qc1NLXCOA
 
 -- Dumped from database version 17.7
 -- Dumped by pg_dump version 17.7
@@ -1084,7 +1084,7 @@ ALTER TABLE ONLY public.user_devices
 -- PostgreSQL database dump complete
 --
 
-\unrestrict F9AizESreuRieL4inRcHWWg3hyNET0FgnBDFBBBU3cZGPEpHjb591l8S2iglpap
+\unrestrict ib0L1tt0kcihJbP9aADEOXJtCsMf5T4lIJeG6jvjTT1gyQCoWtfbB5Qc1NLXCOA
 
 
 --