feat(info): add roundcube and zimbra webmail fingerprints

[TBX3D]

fingerprint roundcube via its login-page body markers and zimbra via
its web client markers, both anded with status 200 and prose-trap
negatives to avoid matching pages that merely mention the products.

[codecov-commenter]

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #291   +/-   ##
=======================================
  Coverage        ?   54.72%           
=======================================
  Files           ?       81           
  Lines           ?     6874           
  Branches        ?        0           
=======================================
  Hits            ?     3762           
  Misses          ?     2843           
  Partials        ?      269           

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[github-actions]

pr summary

3 files changed (+262 -0)

category	files
go source	1
tests	1

[vmfunc]

both matchers are anchored right. roundcube AND's the product string with the new rcube_webmail() bootstrap, zimbra AND's the license string with CLIENT_VERSION, so neither trips on prose that just mentions the product. nice touch on the zimbra extractor: ([^"@]...) drops the unbuilt @buildVersion@ placeholder instead of capturing garbage. regexes are all RE2, no backtracking to worry about. tests hit the cases that matter (prose trap, plain 200, 404, version present/absent).

in.