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/hook/hook.go

@@ -33,6 +33,18 @@ func (f PermissionFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value,
 	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.PermissionMutation", m)
 }
 
+// The RefreshTokenFunc type is an adapter to allow the use of ordinary
+// function as RefreshToken mutator.
+type RefreshTokenFunc func(context.Context, *ent.RefreshTokenMutation) (ent.Value, error)
+
+// Mutate calls f(ctx, m).
+func (f RefreshTokenFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
+	if mv, ok := m.(*ent.RefreshTokenMutation); ok {
+		return f(ctx, mv)
+	}
+	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.RefreshTokenMutation", m)
+}
+
 // The RoleFunc type is an adapter to allow the use of ordinary
 // function as Role mutator.
 type RoleFunc func(context.Context, *ent.RoleMutation) (ent.Value, error)