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/repository/proxy_probe_service.go

@@ -1,76 +1,76 @@
-package repository
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"io"
-	"net/http"
-	"time"
-
-	"github.com/Wei-Shaw/sub2api/internal/pkg/httpclient"
-	"github.com/Wei-Shaw/sub2api/internal/service"
-)
-
-func NewProxyExitInfoProber() service.ProxyExitInfoProber {
-	return &proxyProbeService{ipInfoURL: defaultIPInfoURL}
-}
-
-const defaultIPInfoURL = "https://ipinfo.io/json"
-
-type proxyProbeService struct {
-	ipInfoURL string
-}
-
-func (s *proxyProbeService) ProbeProxy(ctx context.Context, proxyURL string) (*service.ProxyExitInfo, int64, error) {
-	client, err := httpclient.GetClient(httpclient.Options{
-		ProxyURL:           proxyURL,
-		Timeout:            15 * time.Second,
-		InsecureSkipVerify: true,
-		ProxyStrict:        true,
-	})
-	if err != nil {
-		return nil, 0, fmt.Errorf("failed to create proxy client: %w", err)
-	}
-
-	startTime := time.Now()
-	req, err := http.NewRequestWithContext(ctx, "GET", s.ipInfoURL, nil)
-	if err != nil {
-		return nil, 0, fmt.Errorf("failed to create request: %w", err)
-	}
-
-	resp, err := client.Do(req)
-	if err != nil {
-		return nil, 0, fmt.Errorf("proxy connection failed: %w", err)
-	}
-	defer func() { _ = resp.Body.Close() }()
-
-	latencyMs := time.Since(startTime).Milliseconds()
-
-	if resp.StatusCode != http.StatusOK {
-		return nil, latencyMs, fmt.Errorf("request failed with status: %d", resp.StatusCode)
-	}
-
-	var ipInfo struct {
-		IP      string `json:"ip"`
-		City    string `json:"city"`
-		Region  string `json:"region"`
-		Country string `json:"country"`
-	}
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil, latencyMs, fmt.Errorf("failed to read response: %w", err)
-	}
-
-	if err := json.Unmarshal(body, &ipInfo); err != nil {
-		return nil, latencyMs, fmt.Errorf("failed to parse response: %w", err)
-	}
-
-	return &service.ProxyExitInfo{
-		IP:      ipInfo.IP,
-		City:    ipInfo.City,
-		Region:  ipInfo.Region,
-		Country: ipInfo.Country,
-	}, latencyMs, nil
-}
+package repository
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"github.com/Wei-Shaw/sub2api/internal/pkg/httpclient"
+	"github.com/Wei-Shaw/sub2api/internal/service"
+)
+
+func NewProxyExitInfoProber() service.ProxyExitInfoProber {
+	return &proxyProbeService{ipInfoURL: defaultIPInfoURL}
+}
+
+const defaultIPInfoURL = "https://ipinfo.io/json"
+
+type proxyProbeService struct {
+	ipInfoURL string
+}
+
+func (s *proxyProbeService) ProbeProxy(ctx context.Context, proxyURL string) (*service.ProxyExitInfo, int64, error) {
+	client, err := httpclient.GetClient(httpclient.Options{
+		ProxyURL:           proxyURL,
+		Timeout:            15 * time.Second,
+		InsecureSkipVerify: true,
+		ProxyStrict:        true,
+	})
+	if err != nil {
+		return nil, 0, fmt.Errorf("failed to create proxy client: %w", err)
+	}
+
+	startTime := time.Now()
+	req, err := http.NewRequestWithContext(ctx, "GET", s.ipInfoURL, nil)
+	if err != nil {
+		return nil, 0, fmt.Errorf("failed to create request: %w", err)
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, 0, fmt.Errorf("proxy connection failed: %w", err)
+	}
+	defer func() { _ = resp.Body.Close() }()
+
+	latencyMs := time.Since(startTime).Milliseconds()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, latencyMs, fmt.Errorf("request failed with status: %d", resp.StatusCode)
+	}
+
+	var ipInfo struct {
+		IP      string `json:"ip"`
+		City    string `json:"city"`
+		Region  string `json:"region"`
+		Country string `json:"country"`
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, latencyMs, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	if err := json.Unmarshal(body, &ipInfo); err != nil {
+		return nil, latencyMs, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	return &service.ProxyExitInfo{
+		IP:      ipInfo.IP,
+		City:    ipInfo.City,
+		Region:  ipInfo.Region,
+		Country: ipInfo.Country,
+	}, latencyMs, nil
+}