Add test infrastructure with coverage and DB test skipping

- Create @reviq/test-helpers package with shared test utilities
- Add describeE2E helper that auto-prefixes test names with [e2e]
- Support SKIP_DB_TESTS=1 to skip database-dependent tests
- Add unix socket support for TEST_DATABASE_URL
- Add root commands: test:unit, test:all, test:cov, test:unit:cov
- Configure bunfig.toml to exclude dist/ from coverage reports
- Clean up tsconfig.json files to remove redundant settings

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

db/schema.sql

@@ -1,4 +1,4 @@
-\restrict F9AizESreuRieL4inRcHWWg3hyNET0FgnBDFBBBU3cZGPEpHjb591l8S2iglpap
+\restrict 7omiXDURqmmr2m2jWDDMoltRzeUAT80fRWiPifpD7IpQGCLgxQNBFsA5uBgakPg
 
 -- 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 7omiXDURqmmr2m2jWDDMoltRzeUAT80fRWiPifpD7IpQGCLgxQNBFsA5uBgakPg
 
 
 --