core: support default values in placeholders - #7967
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Placeholders may now specify a default value after a colon,
{placeholder:default}, mirroring the syntax already used for environment
variable defaults in the Caddyfile. The default is used when the
placeholder is recognized but evaluates to an empty string. Keys whose
name before the colon is not a recognized placeholder (including JSON
such as {"a": "b"}) are left unchanged.
Closes caddyserver#1793
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Placeholders may specify a default value after a colon, {placeholder:default}, mirroring the syntax already used for environment variable defaults in the Caddyfile. The default is used when the placeholder is recognized but evaluates to an empty string. Keys whose name before the colon is not a recognized placeholder (including JSON such as {"a": "b"}) are left unchanged.
Closes #1793
Assistance Disclosure
Claude Sonnet 5 generated the changes and the commit message, with verification and direction done by myself