refactor: migrate all log statements to structured logger calls for improved observability

cmd/hireme/main.go

@@ -30,8 +30,7 @@ func newRootCmd() *cobra.Command {
 			logger.Log.Info("==========================================================")
 			logger.Log.Info("🚀 Starting Hireme (GJCC) Job Application Command Center")
 			logger.Log.Info("==========================================================")
-			logger.Log.Infof("[Config] Port: %s | DB Path: %s | Target Config: %s | Active LLM: %s | Log Level: %s",
-				cfg.Port, cfg.DBPath, cfg.TargetConfig, cfg.LLMProvider, cfg.LogLevel)
+			logger.Log.Infow("Starting Hireme", "component", "Config", "port", cfg.Port, "db_path", cfg.DBPath, "target_config", cfg.TargetConfig, "llm", cfg.LLMProvider, "log_level", cfg.LogLevel)
 
 			// Ensure DB directory exists
 			dbDir := filepath.Dir(cfg.DBPath)
@@ -48,7 +47,7 @@ func newRootCmd() *cobra.Command {
 
 			// Load targets from YAML config if database is empty
 			if err := database.LoadTargetsFromYAML(cfg.TargetConfig); err != nil {
-				logger.Log.Errorf("[Main] Target YAML loading status: %v", err)
+				logger.Log.Errorw("Target YAML loading failed", "component", "Main", "error", err)
 			}
 
 			// Initialize LLM Analyzer
@@ -60,7 +59,7 @@ func newRootCmd() *cobra.Command {
 			// Load filter configuration
 			filterCfg, err := config.LoadFilterConfig(cfg.FilterConfig)
 			if err != nil {
-				logger.Log.Fatalf("Failed to load filter config: %v", err)
+				logger.Log.Fatalw("Failed to load filter config", "component", "Main", "error", err)
 			}
 
 			// 4. Initialize Worker Pool
@@ -73,7 +72,7 @@ func newRootCmd() *cobra.Command {
 			server.RegisterRoutes(mux)
 
 			addr := fmt.Sprintf(":%s", cfg.Port)
-			logger.Log.Infof("✨ Hireme Command Center is live at http://localhost:%s", cfg.Port)
+			logger.Log.Infow("Hireme Command Center is live", "component", "Main", "url", fmt.Sprintf("http://localhost:%s", cfg.Port))
 			return http.ListenAndServe(addr, mux)
 		},
 	}