Docs: add zh-CN entrypoint translations (#6300)

* Docs: add zh-CN entrypoint translations

* Docs: harden docs-i18n parsing

scripts/docs-i18n/util.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+)
+
+const (
+	workflowVersion = 9
+	providerName    = "pi"
+	modelVersion    = "claude-opus-4-5"
+)
+
+func cacheNamespace() string {
+	return fmt.Sprintf("wf=%d|provider=%s|model=%s", workflowVersion, providerName, modelVersion)
+}
+
+func cacheKey(namespace, srcLang, tgtLang, segmentID, textHash string) string {
+	raw := fmt.Sprintf("%s|%s|%s|%s|%s", namespace, srcLang, tgtLang, segmentID, textHash)
+	hash := sha256.Sum256([]byte(raw))
+	return hex.EncodeToString(hash[:])
+}
+
+func hashText(text string) string {
+	normalized := normalizeText(text)
+	hash := sha256.Sum256([]byte(normalized))
+	return hex.EncodeToString(hash[:])
+}
+
+func hashBytes(data []byte) string {
+	hash := sha256.Sum256(data)
+	return hex.EncodeToString(hash[:])
+}
+
+func normalizeText(text string) string {
+	return strings.Join(strings.Fields(strings.TrimSpace(text)), " ")
+}
+
+func segmentID(relPath, textHash string) string {
+	shortHash := textHash
+	if len(shortHash) > 16 {
+		shortHash = shortHash[:16]
+	}
+	return fmt.Sprintf("%s:%s", relPath, shortHash)
+}
+
+func splitWhitespace(text string) (string, string, string) {
+	if text == "" {
+		return "", "", ""
+	}
+	start := 0
+	for start < len(text) && isWhitespace(text[start]) {
+		start++
+	}
+	end := len(text)
+	for end > start && isWhitespace(text[end-1]) {
+		end--
+	}
+	return text[:start], text[start:end], text[end:]
+}
+
+func isWhitespace(b byte) bool {
+	switch b {
+	case ' ', '\t', '\n', '\r':
+		return true
+	default:
+		return false
+	}
+}
+
+func fatal(err error) {
+	if err == nil {
+		return
+	}
+	_, _ = io.WriteString(os.Stderr, err.Error()+"\n")
+	os.Exit(1)
+}