add basic config and change i18n pkg

internal/api/grpc/config.go

@@ -0,0 +1,34 @@
+package grpc
+
+type Config struct {
+	ServerPort    string
+	GatewayPort   string
+	SearchLimit   int
+	CustomHeaders []string
+}
+
+func (c *Config) ToServerConfig() *ServerConfig {
+	return &ServerConfig{
+		Port:        c.ServerPort,
+		SearchLimit: c.SearchLimit,
+	}
+}
+
+func (c *Config) ToGatewayConfig() *GatewayConfig {
+	return &GatewayConfig{
+		Port:          c.GatewayPort,
+		GRPCEndpoint:  c.ServerPort,
+		CustomHeaders: c.CustomHeaders,
+	}
+}
+
+type ServerConfig struct {
+	Port        string
+	SearchLimit int
+}
+
+type GatewayConfig struct {
+	Port          string
+	GRPCEndpoint  string
+	CustomHeaders []string
+}