fix: Update error handling to Laisky/errors/v2 package across project

- Updated error handling across multiple files with `Laisky/errors/v2` package
- Replaced hardcoded error messages with `Laisky/errors` in relay/channel/tencent/adaptor.go
- Added a function to check if a request should be retried in relay/controller/relay.go
- Removed unused imports and variables, and updated comments in various files
- Changed Redis cache handling in model/cache.go
- Refactored error handling in relay/channel/tencent/main.go and relay/channel/baidu/main.go
- Updated import paths and error handling in model/user.go, model/redemption.go, and controller/github.go
- Added import for tiktoken-go package in relay/channel/openai/token.go
- Added GetSign and ParseConfig functions in relay/channel/tencent/main.go
- Replaced specific error imports with a more general one in relay/channel/ali/adaptor.go
- Updated import comments and function calls in relay/channel/ali/adaptor.go
- Added checks and custom error messages in model/token.go
- Removed unused functions and variables in relay/channel/baidu/adaptor.go
- Imported "github.com/Laisky/errors/v2" package in controller/channel-billing.go
- Removed unused import packages in [relay/channel/tencent/adaptor.go](http://relay/channel/tencent/adaptor.go) and relay/channel/palm/adaptor.go
- Updated go.mod and go.sum files with new dependencies and versions

controller/relay.go

@@ -98,16 +98,12 @@ func Relay(c *gin.Context) {
 	}
 }
 
+// shouldRetry returns nil if should retry, otherwise returns error
 func shouldRetry(c *gin.Context, statusCode int) error {
 	if v, ok := c.Get("specific_channel_id"); ok {
 		return errors.Errorf("specific channel = %v", v)
 	}
-	if statusCode == http.StatusTooManyRequests {
-		return nil
-	}
-	if statusCode/100 == 5 {
-		return nil
-	}
+
 	if statusCode == http.StatusBadRequest {
 		return errors.Errorf("status code = %d", statusCode)
 	}