feat: introduce custom provider example and remove redundant debug logs

- Added `examples/custom-provider/main.go` showcasing custom executor and translator integration using the SDK.
- Removed redundant debug logs from translator modules to enhance code cleanliness.
- Updated SDK documentation with new usage and advanced examples.
- Expanded the management API with new endpoints, including request logging and GPT-5 Codex features.

internal/translator/codex/gemini/codex_gemini_request.go

@@ -15,7 +15,6 @@ import (
 
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/misc"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
-	log "github.com/sirupsen/logrus"
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
 )
@@ -38,7 +37,6 @@ import (
 // Returns:
 //   - []byte: The transformed request data in Codex API format
 func ConvertGeminiRequestToCodex(modelName string, inputRawJSON []byte, _ bool) []byte {
-	log.Debug("ConvertGeminiRequestToCodex")
 	rawJSON := bytes.Clone(inputRawJSON)
 	// Base template
 	out := `{"model":"","instructions":"","input":[]}`

internal/translator/codex/gemini/codex_gemini_response.go

@@ -11,7 +11,6 @@ import (
 	"encoding/json"
 	"time"
 
-	log "github.com/sirupsen/logrus"
 	"github.com/tidwall/gjson"
 	"github.com/tidwall/sjson"
 )
@@ -42,7 +41,6 @@ type ConvertCodexResponseToGeminiParams struct {
 // Returns:
 //   - []string: A slice of strings, each containing a Gemini-compatible JSON response
 func ConvertCodexResponseToGemini(_ context.Context, modelName string, originalRequestRawJSON, requestRawJSON, rawJSON []byte, param *any) []string {
-	log.Debug("ConvertCodexResponseToGemini")
 	if *param == nil {
 		*param = &ConvertCodexResponseToGeminiParams{
 			Model:             modelName,
@@ -154,7 +152,6 @@ func ConvertCodexResponseToGemini(_ context.Context, modelName string, originalR
 // Returns:
 //   - string: A Gemini-compatible JSON response containing all message content and metadata
 func ConvertCodexResponseToGeminiNonStream(_ context.Context, modelName string, originalRequestRawJSON, requestRawJSON, rawJSON []byte, _ *any) string {
-	log.Debug("ConvertCodexResponseToGeminiNonStream")
 	scanner := bufio.NewScanner(bytes.NewReader(rawJSON))
 	buffer := make([]byte, 10240*1024)
 	scanner.Buffer(buffer, 10240*1024)