feat: game lobby service

mail/templates/lobby.membership.blocked/en/subject.tmpl

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+Member removed from {{.game_name}}

mail/templates/lobby.membership.blocked/en/text.tmpl

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+{{.membership_user_name}} ({{.membership_user_id}}) was removed from {{.game_name}} because the account is no longer active ({{.reason}}).
+
+Game ID: {{.game_id}}

mail/templates/lobby.race_name.registered/en/subject.tmpl

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+Race name "{{.race_name}}" is now registered

mail/templates/lobby.race_name.registered/en/text.tmpl

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+Your race name "{{.race_name}}" is now permanently registered.

mail/templates/lobby.race_name.registration_denied/en/subject.tmpl

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+Race name "{{.race_name}}" cannot be registered after {{.game_name}}

mail/templates/lobby.race_name.registration_denied/en/text.tmpl

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+The race name "{{.race_name}}" cannot be registered after {{.game_name}}.
+
+Game ID: {{.game_id}}
+Reason: {{.reason}}

mail/templates/lobby.race_name.registration_eligible/en/subject.tmpl

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+Race name "{{.race_name}}" can be registered after {{.game_name}}

mail/templates/lobby.race_name.registration_eligible/en/text.tmpl

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+Your performance in {{.game_name}} qualifies the race name "{{.race_name}}" for permanent registration.
+
+Game ID: {{.game_id}}
+Eligible until (Unix milliseconds): {{.eligible_until_ms}}