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Restore the nil-base fallback in Grape::API::Instance#to_s (#2833)

def_delegators :@base, :to_s (#2581) evaluates nil.to_s and returns ""
for any Instance whose @base is unset -- notably the bare
Grape::API::Instance class itself, which is never mounted and never
has base= called on it, so it stays base-less forever. Anything that
enumerates loaded classes and renders them by string (Sorbet/Tapioca
RBI generation, log/error interpolation) sees an empty name instead of
"Grape::API::Instance", while #name stays correct -- the disagreement
is what makes it surprising.

Replace the delegator with an explicit method that falls back to
Module#to_s via super when @base is nil, matching the pre-3.0 behavior.

Fixes #2832.

Co-authored-by: Claude Haiku 4.5 <noreply@anthropic.com>

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