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/cmd/cyrene/main.go

@@ -149,6 +149,11 @@ func main() {
 	llmCfg.Model = cfg.LLMModel
 	llmCfg.FallbackModel = cfg.LLMFallbackModel
 	llmSelector := llm.NewModelSelector(llmCfg)
+	// Wire LLM call logging to admin panel
+	llmCallLogger := llm.NewCallLogger(200)
+	llmSelector.DefaultAdapter().SetCallLogger(func(c llm.CallRecord) {
+		llmCallLogger.Record(c)
+	})
 	log.Printf("[llm] adapter ready (model=%s)", cfg.LLMModel)
 
 	// === 9. AI-Core: Context Store ===
@@ -211,7 +216,7 @@ func main() {
 	authMgr := api.NewRealAuthManager(cfg.JWTSecret, cfg.JWTExpiryHours, userStore)
 
 	// Build dependencies for gateway handlers
-	llmLogger := llmlog.NewLogger(200)
+	llmLogger := &llmLoggerAdapter{CallLogger: llmCallLogger}
 	traceLogger := tracepkg.NewLogger(500)
 	perfMon := perfpkg.NewMonitor(120, 10*time.Second)
 	perfMon.Start()
@@ -219,7 +224,7 @@ func main() {
 	gwDeps := api.Dependencies{
 		AuthMgr:      authMgr,
 		Orchestrator: orch,
-		LLMLogger:    &llmLoggerAdapter{Logger: llmLogger},
+		LLMLogger:    llmLogger,
 		TraceLog:     &traceAdapter{Logger: traceLogger},
 		PerfMon:      &perfAdapter{Monitor: perfMon},
 		ModelConfig:  api.NewModelConfigStore(),
@@ -269,9 +274,9 @@ func main() {
 	_ = orch
 }
 // llmLoggerAdapter adapts llm.Logger to api.LLMCallLogger interface.
-type llmLoggerAdapter struct{ *llmlog.Logger }
+type llmLoggerAdapter struct{ *llmlog.CallLogger }
 
-func (a *llmLoggerAdapter) Recent(n int) []map[string]any { return a.Logger.RecentMaps(n) }
+func (a *llmLoggerAdapter) Recent(n int) []map[string]any { return a.CallLogger.RecentMaps(n) }
 
 func pluginNamesToMap(names []string) []map[string]string {
 	result := make([]map[string]string, len(names))