Refactor: Implement uber-go/fx dependency injection

- Replace global variable pattern with proper dependency injection
- Add uber-go/fx for automatic dependency resolution
- Refactor all services and handlers to use constructor injection
- Eliminate fragile initialization order dependencies
- Improve testability and modularity
- Add structured logging with zap

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

internal/auth/jwt.go

@@ -10,33 +10,25 @@ import (
 )
 
 type JwtTokenGenerator struct {
-	Key      string
-	Issuer   string
-	Audience string
+	cfg *config.Config
 }
 
-var JwtTokenGeneratorInstance *JwtTokenGenerator
-
-func InitJwtTokenGenerator() {
-	JwtTokenGeneratorInstance = &JwtTokenGenerator{
-		Key:      config.Config.JwtSecret,
-		Issuer:   config.Config.JwtIssuer,
-		Audience: config.Config.JwtAudience,
-	}
+func NewJwtTokenGenerator(cfg *config.Config) *JwtTokenGenerator {
+	return &JwtTokenGenerator{cfg: cfg}
 }
 
 func (j *JwtTokenGenerator) GenerateToken(claims map[string]interface{}) (string, error) {
 	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
 		"exp": time.Now().AddDate(0, 0, 1).Unix(),
 		"iat": time.Now().Unix(),
-		"iss": j.Issuer,
-		"aud": j.Audience,
+		"iss": j.cfg.JwtIssuer,
+		"aud": j.cfg.JwtAudience,
 	})
 	for k, v := range claims {
 		token.Claims.(jwt.MapClaims)[k] = v
 	}
 
-	return token.SignedString([]byte(j.Key))
+	return token.SignedString([]byte(j.cfg.JwtSecret))
 }
 
 // Gin middleware
@@ -53,7 +45,7 @@ func (j *JwtTokenGenerator) GinMiddleware() gin.HandlerFunc {
 			if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
 				return nil, jwt.ErrSignatureInvalid
 			}
-			return []byte(j.Key), nil
+			return []byte(j.cfg.JwtSecret), nil
 		})
 
 		if err != nil {
@@ -69,4 +61,4 @@ func (j *JwtTokenGenerator) GinMiddleware() gin.HandlerFunc {
 
 		c.Next()
 	}
-}
+}