Introduce registration gatekeeper - #1257
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The api hands the facts of a registration attempt (email address, client IP address, user agent, requested domain, captcha state) to the gatekeeper service and acts on its verdict: allow, drop (discard the request, but give the client the regular response), or reject (400 Bad Request). The arbiter runs in its own container, reachable from api only and without access to the rest of the stack; its reasoning is logged, but never disclosed to the client, and failure to obtain a verdict allows the request. The arbiter shipped here allows everything; gatekeeper/README.md documents the interface.
The arbiter matches the address of a registration attempt against the patterns in email-blocklist.txt and answers with a drop verdict naming the matching line, so that no account is created and no activation email is sent while the client receives the usual response. Patterns are shell-style globs matched case-insensitively; a line starting with ! is an exception, and the first matching line decides. The file is read on every request, and the directory holding it is mounted read-only into the gatekeeper container as configured by DESECSTACK_GATEKEEPER_CONF; if it cannot be read, no address is blocked.
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