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Adds internal/clientcert: a cert/key pair matched to hosts by the same
substring-or-regex pattern model as scope.Rule, so mitmux can present
a client certificate on an upstream TLS handshake that requires one -
the previous behavior was a hard handshake failure with no way to
authenticate. Wired into both places mitmux dials an https:// upstream
over its own TLS client connection: proxy.go's handleConnect (live
proxied traffic) and repeat.go's dialForRepeat (Repeater/Intruder
resends), both through a new Server.clientCertFor(host) helper.
Stored in a new client_certs table, mirroring the existing scope_rules
persistence pattern. The TUI (`t` from history) is add-only like
scope, for the same reason: delete and re-add covers changing
anything, and it's a rarely-touched, low-cardinality list. The add
form takes cert/key file paths and reads them once at save time - PEM
content, not the path, is what's stored and later presented, so a
cert keeps working even if the original file moves afterward.
Verified live against a real mutual-TLS-requiring origin server:
without a matching cert the handshake correctly fails; with one
configured, the origin receives it and the request succeeds; toggling
it off reproduces the failure, confirming the enable/disable path
works end to end.
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