Refactor configuration and key management

- Removed key management configuration from .env.example and related code.
- Updated Makefile to load environment variables for HOST and PORT.
- Modified main.go to handle request logging with a wait group for graceful shutdown.
- Simplified dashboard statistics handler to focus on key counts and request metrics.
- Removed key manager implementation and related interfaces.
- Updated proxy server to use atomic counters for round-robin key selection.
- Cleaned up unused types and configurations in types.go.
- Added package-lock.json for frontend dependencies.

internal/types/types.go

@@ -2,15 +2,12 @@
 package types
 
 import (
-	"time"
-
 	"github.com/gin-gonic/gin"
 )
 
 // ConfigManager defines the interface for configuration management
 type ConfigManager interface {
 	GetServerConfig() ServerConfig
-	GetKeysConfig() KeysConfig
 	GetOpenAIConfig() OpenAIConfig
 	GetAuthConfig() AuthConfig
 	GetCORSConfig() CORSConfig
@@ -21,18 +18,6 @@ type ConfigManager interface {
 	ReloadConfig() error
 }
 
-// KeyManager defines the interface for API key management
-type KeyManager interface {
-	LoadKeys() error
-	GetNextKey() (*KeyInfo, error)
-	RecordSuccess(key string)
-	RecordFailure(key string, err error)
-	GetStats() Stats
-	ResetBlacklist()
-	GetBlacklist() []BlacklistEntry
-	Close()
-}
-
 // ProxyServer defines the interface for proxy server
 type ProxyServer interface {
 	HandleProxy(c *gin.Context)
@@ -49,14 +34,6 @@ type ServerConfig struct {
 	GracefulShutdownTimeout int    `json:"gracefulShutdownTimeout"`
 }
 
-// KeysConfig represents keys configuration
-type KeysConfig struct {
-	FilePath           string `json:"filePath"`
-	StartIndex         int    `json:"startIndex"`
-	BlacklistThreshold int    `json:"blacklistThreshold"`
-	MaxRetries         int    `json:"maxRetries"`
-}
-
 // OpenAIConfig represents OpenAI API configuration
 type OpenAIConfig struct {
 	BaseURL         string   `json:"baseUrl"`
@@ -95,48 +72,3 @@ type LogConfig struct {
 	FilePath      string `json:"filePath"`
 	EnableRequest bool   `json:"enableRequest"`
 }
-
-// KeyInfo represents API key information
-type KeyInfo struct {
-	Key     string `json:"key"`
-	Index   int    `json:"index"`
-	Preview string `json:"preview"`
-}
-
-// Stats represents system statistics
-type Stats struct {
-	CurrentIndex    int64       `json:"currentIndex"`
-	TotalKeys       int         `json:"totalKeys"`
-	HealthyKeys     int         `json:"healthyKeys"`
-	BlacklistedKeys int         `json:"blacklistedKeys"`
-	SuccessCount    int64       `json:"successCount"`
-	FailureCount    int64       `json:"failureCount"`
-	MemoryUsage     MemoryUsage `json:"memoryUsage"`
-}
-
-// MemoryUsage represents memory usage statistics
-type MemoryUsage struct {
-	Alloc        uint64 `json:"alloc"`
-	TotalAlloc   uint64 `json:"totalAlloc"`
-	Sys          uint64 `json:"sys"`
-	NumGC        uint32 `json:"numGC"`
-	LastGCTime   string `json:"lastGCTime"`
-	NextGCTarget uint64 `json:"nextGCTarget"`
-}
-
-// BlacklistEntry represents a blacklisted key entry
-type BlacklistEntry struct {
-	Key         string    `json:"key"`
-	Preview     string    `json:"preview"`
-	Reason      string    `json:"reason"`
-	BlacklistAt time.Time `json:"blacklistAt"`
-	FailCount   int       `json:"failCount"`
-}
-
-// RetryError represents retry error information
-type RetryError struct {
-	StatusCode   int    `json:"statusCode"`
-	ErrorMessage string `json:"errorMessage"`
-	KeyIndex     int    `json:"keyIndex"`
-	Attempt      int    `json:"attempt"`
-}