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/server/routes/common.go

@@ -1,32 +1,32 @@
-package routes
-
-import (
-	"net/http"
-
-	"github.com/gin-gonic/gin"
-)
-
-// RegisterCommonRoutes 注册通用路由（健康检查、状态等）
-func RegisterCommonRoutes(r *gin.Engine) {
-	// 健康检查
-	r.GET("/health", func(c *gin.Context) {
-		c.JSON(http.StatusOK, gin.H{"status": "ok"})
-	})
-
-	// Claude Code 遥测日志（忽略，直接返回200）
-	r.POST("/api/event_logging/batch", func(c *gin.Context) {
-		c.Status(http.StatusOK)
-	})
-
-	// Setup status endpoint (always returns needs_setup: false in normal mode)
-	// This is used by the frontend to detect when the service has restarted after setup
-	r.GET("/setup/status", func(c *gin.Context) {
-		c.JSON(http.StatusOK, gin.H{
-			"code": 0,
-			"data": gin.H{
-				"needs_setup": false,
-				"step":        "completed",
-			},
-		})
-	})
-}
+package routes
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+// RegisterCommonRoutes 注册通用路由（健康检查、状态等）
+func RegisterCommonRoutes(r *gin.Engine) {
+	// 健康检查
+	r.GET("/health", func(c *gin.Context) {
+		c.JSON(http.StatusOK, gin.H{"status": "ok"})
+	})
+
+	// Claude Code 遥测日志（忽略，直接返回200）
+	r.POST("/api/event_logging/batch", func(c *gin.Context) {
+		c.Status(http.StatusOK)
+	})
+
+	// Setup status endpoint (always returns needs_setup: false in normal mode)
+	// This is used by the frontend to detect when the service has restarted after setup
+	r.GET("/setup/status", func(c *gin.Context) {
+		c.JSON(http.StatusOK, gin.H{
+			"code": 0,
+			"data": gin.H{
+				"needs_setup": false,
+				"step":        "completed",
+			},
+		})
+	})
+}