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/turnstile_service.go

@@ -1,62 +1,62 @@
-package repository
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"net/http"
-	"net/url"
-	"strings"
-	"time"
-
-	"github.com/Wei-Shaw/sub2api/internal/pkg/httpclient"
-	"github.com/Wei-Shaw/sub2api/internal/service"
-)
-
-const turnstileVerifyURL = "https://challenges.cloudflare.com/turnstile/v0/siteverify"
-
-type turnstileVerifier struct {
-	httpClient *http.Client
-	verifyURL  string
-}
-
-func NewTurnstileVerifier() service.TurnstileVerifier {
-	sharedClient, err := httpclient.GetClient(httpclient.Options{
-		Timeout: 10 * time.Second,
-	})
-	if err != nil {
-		sharedClient = &http.Client{Timeout: 10 * time.Second}
-	}
-	return &turnstileVerifier{
-		httpClient: sharedClient,
-		verifyURL:  turnstileVerifyURL,
-	}
-}
-
-func (v *turnstileVerifier) VerifyToken(ctx context.Context, secretKey, token, remoteIP string) (*service.TurnstileVerifyResponse, error) {
-	formData := url.Values{}
-	formData.Set("secret", secretKey)
-	formData.Set("response", token)
-	if remoteIP != "" {
-		formData.Set("remoteip", remoteIP)
-	}
-
-	req, err := http.NewRequestWithContext(ctx, http.MethodPost, v.verifyURL, strings.NewReader(formData.Encode()))
-	if err != nil {
-		return nil, fmt.Errorf("create request: %w", err)
-	}
-	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
-
-	resp, err := v.httpClient.Do(req)
-	if err != nil {
-		return nil, fmt.Errorf("send request: %w", err)
-	}
-	defer func() { _ = resp.Body.Close() }()
-
-	var result service.TurnstileVerifyResponse
-	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
-		return nil, fmt.Errorf("decode response: %w", err)
-	}
-
-	return &result, nil
-}
+package repository
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/Wei-Shaw/sub2api/internal/pkg/httpclient"
+	"github.com/Wei-Shaw/sub2api/internal/service"
+)
+
+const turnstileVerifyURL = "https://challenges.cloudflare.com/turnstile/v0/siteverify"
+
+type turnstileVerifier struct {
+	httpClient *http.Client
+	verifyURL  string
+}
+
+func NewTurnstileVerifier() service.TurnstileVerifier {
+	sharedClient, err := httpclient.GetClient(httpclient.Options{
+		Timeout: 10 * time.Second,
+	})
+	if err != nil {
+		sharedClient = &http.Client{Timeout: 10 * time.Second}
+	}
+	return &turnstileVerifier{
+		httpClient: sharedClient,
+		verifyURL:  turnstileVerifyURL,
+	}
+}
+
+func (v *turnstileVerifier) VerifyToken(ctx context.Context, secretKey, token, remoteIP string) (*service.TurnstileVerifyResponse, error) {
+	formData := url.Values{}
+	formData.Set("secret", secretKey)
+	formData.Set("response", token)
+	if remoteIP != "" {
+		formData.Set("remoteip", remoteIP)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, v.verifyURL, strings.NewReader(formData.Encode()))
+	if err != nil {
+		return nil, fmt.Errorf("create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+
+	resp, err := v.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("send request: %w", err)
+	}
+	defer func() { _ = resp.Body.Close() }()
+
+	var result service.TurnstileVerifyResponse
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, fmt.Errorf("decode response: %w", err)
+	}
+
+	return &result, nil
+}