feat: add SMS verification registration with UniSMS provider

- Add phone field to user model with index and helper methods
- Implement SMS provider interface with UniSMS (合一短信) implementation
- Add SMS verification code sending endpoint with rate limiting (1/60s)
- Support SMS registration in Register() (mutually exclusive with email)
- Add SMS configuration to admin settings (provider, keys, signature, template)
- Display phone number in admin user list contact column
- Add i18n translations for all SMS-related messages (zh-CN, en, zh-TW)
- Add Claude Code skills: sync-upstream, migrate-server
- Update CLAUDE.md with git conventions and deployment guide

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

middleware/sms-verification-rate-limit.go

@@ -0,0 +1,77 @@
+package middleware
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/QuantumNous/new-api/common"
+
+	"github.com/gin-gonic/gin"
+)
+
+const (
+	SmsVerificationRateLimitMark = "SMS"
+	SmsVerificationMaxRequests   = 1  // 60 seconds max 1 request
+	SmsVerificationDuration      = 60 // 60 second window
+)
+
+func redisSmsVerificationRateLimiter(c *gin.Context) {
+	ctx := context.Background()
+	rdb := common.RDB
+	key := "smsVerification:" + SmsVerificationRateLimitMark + ":" + c.ClientIP()
+
+	count, err := rdb.Incr(ctx, key).Result()
+	if err != nil {
+		memorySmsVerificationRateLimiter(c)
+		return
+	}
+
+	if count == 1 {
+		_ = rdb.Expire(ctx, key, time.Duration(SmsVerificationDuration)*time.Second).Err()
+	}
+
+	if count <= int64(SmsVerificationMaxRequests) {
+		c.Next()
+		return
+	}
+
+	ttl, err := rdb.TTL(ctx, key).Result()
+	waitSeconds := int64(SmsVerificationDuration)
+	if err == nil && ttl > 0 {
+		waitSeconds = int64(ttl.Seconds())
+	}
+
+	c.JSON(http.StatusTooManyRequests, gin.H{
+		"success": false,
+		"message": fmt.Sprintf("发送过于频繁，请等待 %d 秒后再试", waitSeconds),
+	})
+	c.Abort()
+}
+
+func memorySmsVerificationRateLimiter(c *gin.Context) {
+	key := SmsVerificationRateLimitMark + ":" + c.ClientIP()
+
+	if !inMemoryRateLimiter.Request(key, SmsVerificationMaxRequests, SmsVerificationDuration) {
+		c.JSON(http.StatusTooManyRequests, gin.H{
+			"success": false,
+			"message": "发送过于频繁，请稍后再试",
+		})
+		c.Abort()
+		return
+	}
+
+	c.Next()
+}
+
+func SmsVerificationRateLimit() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if common.RedisEnabled {
+			redisSmsVerificationRateLimiter(c)
+		} else {
+			inMemoryRateLimiter.Init(common.RateLimitKeyExpirationDuration)
+			memorySmsVerificationRateLimiter(c)
+		}
+	}
+}