feat(errs): add 8 MCP error codes + HTTPStatus mapping

internal/infra/errs/errs.go

@@ -86,6 +86,16 @@ const (
 	CodeAcpSpawnFailed            Code = "acp.spawn_failed"
 	CodeAcpHandshakeTimeout       Code = "acp.handshake_timeout"
 	CodeAcpFsPathOutsideWorktree  Code = "acp.fs_path_outside_worktree"
+
+	// MCP 域
+	CodeMcpTokenInvalid          Code = "mcp.token_invalid"
+	CodeMcpTokenRevoked          Code = "mcp.token_revoked"
+	CodeMcpTokenExpired          Code = "mcp.token_expired"
+	CodeMcpTokenNotFound         Code = "mcp.token_not_found"
+	CodeMcpTokenScopeViolation   Code = "mcp.token_scope_violation"
+	CodeMcpTokenNameRequired     Code = "mcp.token_name_required"
+	CodeMcpTokenExpiresRequired  Code = "mcp.token_expires_required"
+	CodeMcpRateLimited           Code = "mcp.rate_limited"
 )
 
 // AppError is the application's structured error type. It carries a stable
@@ -210,6 +220,16 @@ func HTTPStatus(code Code) int {
 		return http.StatusInternalServerError
 	case CodeWebhookNotConfigured:
 		return http.StatusServiceUnavailable
+	case CodeMcpTokenInvalid, CodeMcpTokenRevoked, CodeMcpTokenExpired:
+		return http.StatusUnauthorized
+	case CodeMcpTokenNotFound:
+		return http.StatusNotFound
+	case CodeMcpTokenScopeViolation:
+		return http.StatusForbidden
+	case CodeMcpTokenNameRequired, CodeMcpTokenExpiresRequired:
+		return http.StatusBadRequest
+	case CodeMcpRateLimited:
+		return http.StatusTooManyRequests
 	default:
 		return http.StatusInternalServerError
 	}