Validate platform worker consolidation

[chitcommit]

Description\nValidate that all 34+ services are properly consolidated into the unified platform worker.\n\nTasks\n- [ ] Verify all service handlers are registered\n- [ ] Test routing for each service endpoint\n- [ ] Validate shared resource bindings\n- [ ] Check backward compatibility with legacy subdomains\n\nSuccess Criteria\n- All services respond to health checks\n- No 404s on legacy routes\n- Shared AI/KV/DB bindings working\n