feat: 品牌重命名 Sub2API -> TianShuAPI

- 前端: 所有界面显示、i18n 文本、组件中的品牌名称
- 后端: 服务层、设置默认值、邮件模板、安装向导
- 数据库: 迁移脚本注释
- 保持功能完全一致，仅更改品牌名称

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

backend/internal/pkg/geminicli/sanitize.go

@@ -1,46 +1,46 @@
-package geminicli
-
-import "strings"
-
-const maxLogBodyLen = 2048
-
-func SanitizeBodyForLogs(body string) string {
-	body = truncateBase64InMessage(body)
-	if len(body) > maxLogBodyLen {
-		body = body[:maxLogBodyLen] + "...[truncated]"
-	}
-	return body
-}
-
-func truncateBase64InMessage(message string) string {
-	const maxBase64Length = 50
-
-	result := message
-	offset := 0
-	for {
-		idx := strings.Index(result[offset:], ";base64,")
-		if idx == -1 {
-			break
-		}
-		actualIdx := offset + idx
-		start := actualIdx + len(";base64,")
-
-		end := start
-		for end < len(result) && isBase64Char(result[end]) {
-			end++
-		}
-
-		if end-start > maxBase64Length {
-			result = result[:start+maxBase64Length] + "...[truncated]" + result[end:]
-			offset = start + maxBase64Length + len("...[truncated]")
-			continue
-		}
-		offset = end
-	}
-
-	return result
-}
-
-func isBase64Char(c byte) bool {
-	return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || c == '+' || c == '/' || c == '='
-}
+package geminicli
+
+import "strings"
+
+const maxLogBodyLen = 2048
+
+func SanitizeBodyForLogs(body string) string {
+	body = truncateBase64InMessage(body)
+	if len(body) > maxLogBodyLen {
+		body = body[:maxLogBodyLen] + "...[truncated]"
+	}
+	return body
+}
+
+func truncateBase64InMessage(message string) string {
+	const maxBase64Length = 50
+
+	result := message
+	offset := 0
+	for {
+		idx := strings.Index(result[offset:], ";base64,")
+		if idx == -1 {
+			break
+		}
+		actualIdx := offset + idx
+		start := actualIdx + len(";base64,")
+
+		end := start
+		for end < len(result) && isBase64Char(result[end]) {
+			end++
+		}
+
+		if end-start > maxBase64Length {
+			result = result[:start+maxBase64Length] + "...[truncated]" + result[end:]
+			offset = start + maxBase64Length + len("...[truncated]")
+			continue
+		}
+		offset = end
+	}
+
+	return result
+}
+
+func isBase64Char(c byte) bool {
+	return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || c == '+' || c == '/' || c == '='
+}