fix: localize toml parse errors

internal/agents/store.go

@@ -2,7 +2,6 @@ package agents
 
 import (
 	"bufio"
-	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -136,7 +135,7 @@ func parseSimpleTOML(input string) (map[string]string, error) {
 			return values, fmt.Errorf("第 %d 行重复字段名 %q", lineNumber, key)
 		}
 
-		value, err := parseTOMLString(raw, scanner)
+		value, err := parseTOMLString(raw, scanner, lineNumber)
 		if err != nil {
 			return values, err
 		}
@@ -167,27 +166,27 @@ func isValidBareKey(key string) bool {
 	return true
 }
 
-func parseTOMLString(raw string, scanner *bufio.Scanner) (string, error) {
+func parseTOMLString(raw string, scanner *bufio.Scanner, lineNumber int) (string, error) {
 	if strings.HasPrefix(raw, `"""`) {
 		block := strings.TrimPrefix(raw, `"""`)
 		for !strings.Contains(block, `"""`) && scanner.Scan() {
 			block += "\n" + scanner.Text()
 		}
 		if !strings.Contains(block, `"""`) {
-			return "", errors.New("未闭合的多行字符串")
+			return "", fmt.Errorf("第 %d 行未闭合的多行字符串", lineNumber)
 		}
 		value, trailing, _ := strings.Cut(block, `"""`)
 		if strings.TrimSpace(trailing) != "" {
-			return "", errors.New("多行字符串后存在不支持的内容")
+			return "", fmt.Errorf("第 %d 行多行字符串后存在不支持的内容", lineNumber)
 		}
 		return value, nil
 	}
 	if !strings.HasPrefix(raw, `"`) {
-		return "", errors.New("仅支持字符串字段")
+		return "", fmt.Errorf("第 %d 行仅支持字符串字段", lineNumber)
 	}
 	value, err := strconv.Unquote(raw)
 	if err != nil {
-		return "", err
+		return "", fmt.Errorf("第 %d 行字符串字段语法无效", lineNumber)
 	}
 	return value, nil
 }

internal/agents/store_test.go

@@ -70,6 +70,7 @@ func TestListAgentsReportsParseError(t *testing.T) {
 	if got[0].ParseStatus != "invalid" || got[0].ParseError == "" {
 		t.Fatalf("expected invalid parse status, got %#v", got[0])
 	}
+	assertChineseTOMLError(t, got[0].ParseError)
 }
 
 func TestListAgentsReportsDuplicateKeyAsParseError(t *testing.T) {

internal/agents/writeback_test.go

@@ -21,6 +21,7 @@ func TestValidateInvalidTOMLReturnsInvalidAndDoesNotWrite(t *testing.T) {
 	if len(got.Errors) == 0 {
 		t.Fatalf("expected validation errors: %#v", got)
 	}
+	assertChineseTOMLError(t, got.Errors[0])
 	assertFileContent(t, target, `name = "旧名称"`+"\n")
 }
 
@@ -56,6 +57,7 @@ func TestWriteInvalidTOMLRejectsAndLeavesOriginal(t *testing.T) {
 	if err == nil {
 		t.Fatal("expected invalid TOML write to be rejected")
 	}
+	assertChineseTOMLError(t, err.Error())
 	assertFileContent(t, target, `name = "旧名称"`+"\n")
 }
 
@@ -159,3 +161,13 @@ func assertFileContent(t *testing.T, path string, want string) {
 		t.Fatalf("%s content = %q, want %q", path, string(got), want)
 	}
 }
+
+func assertChineseTOMLError(t *testing.T, message string) {
+	t.Helper()
+	if strings.Contains(message, "invalid syntax") {
+		t.Fatalf("TOML error leaked English parser text: %q", message)
+	}
+	if !strings.Contains(message, "字符串字段语法无效") {
+		t.Fatalf("TOML error = %q, want Chinese string syntax error", message)
+	}
+}