Enhance build system and logging configuration

- Add scripts/build.sh to compile binaries into bin/ directory

- Move all zerolog setup logic from cmd/server/main.go to pkg/config

- Add log level configuration support (trace, debug, info, warn, error, fatal, panic)

- Simplify cmd/server/main.go from 57 to 27 lines (53% reduction)

- Update .gitignore to use bin/ directory instead of individual files

- Document build process and bin directory in AGENTS.md

- Maintain backward compatibility with all existing functionality

cmd/server/main.go

@@ -2,49 +2,19 @@ package main
 
 import (
 	"context"
-	"os"
 
 	"DanceLessonsCoach/pkg/config"
 	"DanceLessonsCoach/pkg/server"
-	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
 )
 
 func main() {
-	// Initialize Zerolog with default console format first
-	zerolog.SetGlobalLevel(zerolog.TraceLevel)
-	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
-	consoleWriter := zerolog.ConsoleWriter{Out: os.Stderr}
-
-	// Check if JSON logging is requested via environment variable
-	// This allows JSON logging even during config loading
-	jsonLogging := os.Getenv("DLC_LOGGING_JSON") == "true"
-
-	if jsonLogging {
-		// JSON output for structured logging
-		log.Logger = log.Output(os.Stderr)
-	} else {
-		// Console output for initial logging
-		log.Logger = log.Output(consoleWriter)
-	}
-
-	// Load configuration
+	// Load configuration (this will also setup logging)
 	cfg, err := config.LoadConfig()
 	if err != nil {
 		log.Fatal().Err(err).Msg("Failed to load configuration")
 	}
 
-	// Reconfigure logging based on loaded configuration (overrides env var)
-	if cfg.Logging.JSON {
-		// JSON output for structured logging
-		log.Logger = log.Output(os.Stderr)
-	} else {
-		// Keep console output
-		log.Logger = log.Output(consoleWriter)
-	}
-
-	log.Info().Bool("json_logging", cfg.Logging.JSON).Msg("Logging configured")
-
 	// Create readiness context to control readiness state
 	readyCtx, readyCancel := context.WithCancel(context.Background())
 	defer readyCancel()