feat: initialize Go agent module with config, Makefile and project structure

Agent/internal/config/config.go

@@ -0,0 +1,40 @@
+package config
+
+import (
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	ServerAddress     string `yaml:"server_address"`
+	AgentID           string `yaml:"agent_id"`
+	HeartbeatInterval int    `yaml:"heartbeat_interval"`
+	TLSEnabled        bool   `yaml:"tls_enabled"`
+}
+
+func Load(path string) (*Config, error) {
+	cfg := &Config{
+		ServerAddress:     "localhost:5001",
+		HeartbeatInterval: 60,
+	}
+	data, err := os.ReadFile(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return cfg, nil
+		}
+		return nil, err
+	}
+	if err := yaml.Unmarshal(data, cfg); err != nil {
+		return nil, err
+	}
+	return cfg, nil
+}
+
+func (c *Config) Save(path string) error {
+	data, err := yaml.Marshal(c)
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(path, data, 0600)
+}