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/migrate/schema.go

@@ -64,6 +64,37 @@ var (
 		Columns:    PermissionsColumns,
 		PrimaryKey: []*schema.Column{PermissionsColumns[0]},
 	}
+	// RefreshTokensColumns holds the columns for the "refresh_tokens" table.
+	RefreshTokensColumns = []*schema.Column{
+		{Name: "id", Type: field.TypeString, Unique: true},
+		{Name: "user_id", Type: field.TypeString},
+		{Name: "token_hash", Type: field.TypeString},
+		{Name: "expires_at", Type: field.TypeTime},
+		{Name: "created_at", Type: field.TypeTime},
+	}
+	// RefreshTokensTable holds the schema information for the "refresh_tokens" table.
+	RefreshTokensTable = &schema.Table{
+		Name:       "refresh_tokens",
+		Columns:    RefreshTokensColumns,
+		PrimaryKey: []*schema.Column{RefreshTokensColumns[0]},
+		Indexes: []*schema.Index{
+			{
+				Name:    "refreshtoken_user_id",
+				Unique:  false,
+				Columns: []*schema.Column{RefreshTokensColumns[1]},
+			},
+			{
+				Name:    "refreshtoken_token_hash",
+				Unique:  false,
+				Columns: []*schema.Column{RefreshTokensColumns[2]},
+			},
+			{
+				Name:    "refreshtoken_expires_at",
+				Unique:  false,
+				Columns: []*schema.Column{RefreshTokensColumns[3]},
+			},
+		},
+	}
 	// RolesColumns holds the columns for the "roles" table.
 	RolesColumns = []*schema.Column{
 		{Name: "id", Type: field.TypeString, Unique: true},
@@ -182,6 +213,7 @@ var (
 	Tables = []*schema.Table{
 		AuditLogsTable,
 		PermissionsTable,
+		RefreshTokensTable,
 		RolesTable,
 		RolePermissionsTable,
 		UsersTable,