feat(auth): Complete Auth Service implementation and fix Consul health checks

- Add VerifyPassword RPC to Identity Service
  - Added to proto file and generated code
  - Implemented in Identity Service gRPC server
  - Added to Identity Service client interface and gRPC client

- Complete RefreshToken implementation
  - Store refresh tokens in database using RefreshToken entity
  - Validate refresh tokens with expiration checking
  - Revoke refresh tokens on logout and token rotation

- Integrate Authz Service for role retrieval
  - Added AuthzServiceClient to Auth Service
  - Get user roles during login and token refresh
  - Gracefully handle Authz Service failures

- Require JWT secret in configuration
  - Removed default secret fallback
  - Service fails to start if JWT secret is not configured

- Fix Consul health checks for Docker
  - Services now register with Docker service names (e.g., audit-service)
  - Allows Consul (in Docker) to reach services via Docker DNS
  - Health checks use gRPC service names instead of localhost

This completes all TODOs in auth_service_fx.go and fixes the Consul
health check failures in Docker environments.

internal/ent/ent.go

@@ -14,6 +14,7 @@ import (
 	"entgo.io/ent/dialect/sql/sqlgraph"
 	"git.dcentral.systems/toolz/goplt/internal/ent/auditlog"
 	"git.dcentral.systems/toolz/goplt/internal/ent/permission"
+	"git.dcentral.systems/toolz/goplt/internal/ent/refreshtoken"
 	"git.dcentral.systems/toolz/goplt/internal/ent/role"
 	"git.dcentral.systems/toolz/goplt/internal/ent/rolepermission"
 	"git.dcentral.systems/toolz/goplt/internal/ent/user"
@@ -80,6 +81,7 @@ func checkColumn(t, c string) error {
 		columnCheck = sql.NewColumnCheck(map[string]func(string) bool{
 			auditlog.Table:       auditlog.ValidColumn,
 			permission.Table:     permission.ValidColumn,
+			refreshtoken.Table:   refreshtoken.ValidColumn,
 			role.Table:           role.ValidColumn,
 			rolepermission.Table: rolepermission.ValidColumn,
 			user.Table:           user.ValidColumn,