feat(llm): add LLM call recording with admin panel integration

- llm.Adapter: SetCallLogger hook for recording every API call
- llm.CallLogger: ring-buffer with Recent+Stats for admin API
- main.go: wire DeepSeek adapter to CallLogger
- Fix: single CallLogger instance for both recording and display
- Metrics: model name, duration, success/fail, tokens
- All 16 packages pass

backend/services/platform-bridge/config.go

@@ -6,7 +6,7 @@ package bridge
 import (
 	"encoding/json"
 	"fmt"
-	"log"
+	"git.yeij.top/AskaEth/Cyrene_v2/internal/logger"
 	"os"
 	"path/filepath"
 	"sync"
@@ -83,7 +83,7 @@ func (s *ConfigStore) StartWatching(interval time.Duration) {
 					lastMod = info.ModTime()
 					s.mu.Lock()
 					if s.load() {
-						log.Printf("[bridge] config hot-reloaded (%d adapters)", len(s.config.Adapters))
+						logger.Infof("[bridge] config hot-reloaded (%d adapters)", len(s.config.Adapters))
 						if s.onChange != nil {
 							s.onChange(s.config)
 						}
@@ -184,7 +184,7 @@ func (s *ConfigStore) load() bool {
 	}
 	var cfg BridgeConfig
 	if err := json.Unmarshal(data, &cfg); err != nil {
-		log.Printf("[bridge] config parse error: %v", err)
+		logger.Infof("[bridge] config parse error: %v", err)
 		return false
 	}
 	if cfg.Adapters == nil {