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

scripts/build.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# DanceLessonsCoach Build Script
+# Builds binaries into the bin/ directory
+
+set -e
+
+echo "🔨 Building DanceLessonsCoach binaries..."
+
+# Create bin directory if it doesn't exist
+mkdir -p bin
+
+# Build server binary
+echo "📦 Building server..."
+go build -o bin/server ./cmd/server
+
+# Build greet CLI binary
+echo "📦 Building greet CLI..."
+go build -o bin/greet ./cmd/greet
+
+echo "✅ Build complete!"
+echo "   Server binary: ./bin/server"
+echo "   Greet binary:  ./bin/greet"
+echo ""
+echo "💡 To run the server: ./bin/server"
+echo "💡 To use the greet CLI: ./bin/greet [name]"