[Feautre] mcpServer.spec.deployment.env should be standard env api

[Colvin-Y]

Why we need it

Current env field is a simple map (map[string]string), but user may want to config env by dowardAPI

How to do

change api same as pod.spec.containers.env

FIELDS:
  name	<string> -required-
    Name of the environment variable. Must be a C_IDENTIFIER.

  value	<string>
    Variable references $(VAR_NAME) are expanded using the previously defined
    environment variables in the container and any service environment
    variables. If a variable cannot be resolved, the reference in the input
    string will be unchanged. Double $$ are reduced to a single $, which allows
    for escaping the $(VAR_NAME) syntax: i.e. "$$(VAR_NAME)" will produce the
    string literal "$(VAR_NAME)". Escaped references will never be expanded,
    regardless of whether the variable exists or not. Defaults to "".

  valueFrom	<EnvVarSource>
    Source for the environment variable's value. Cannot be used if value is not
    empty.