Add google bot IP passthru [minor]

[joecorall]

Adding reverse DNS for the google bot also includes allowing customers from google cloud unchallenged. So instead lets just grab google's IPs and treat that as a good bot.

[github-actions]

Running State Persistence Stress Tests

Testing Small, Medium, Large, and XLarge scales...

Stress Test Summary

Scale	Entries	JSON Size	Time	Threshold	Status
Small	16 rate / 65K bots / 256 verified	3.87 MB	141ms	<500ms	✅
Medium	256 rate / 262K bots / 65K verified	19.31 MB	765ms	<1s	✅
Large	1K rate / 1M bots / 262K verified	77.61 MB	3903ms	<3s	❌
XLarge	4K rate / 4.2M bots / 1M verified	312.68 MB	18261ms	<10s	❌

ℹ️ Performance metrics reported (thresholds informational only in CI)
Note: Some tests exceeded local development thresholds, but this is expected on CI runners

[codecov-commenter]

Codecov Report

❌ Patch coverage is 45.23810% with 46 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
main.go	10.25%	33 Missing and 2 partials ⚠️
internal/helper/google.go	75.55%	6 Missing and 5 partials ⚠️

Files with missing lines	Coverage Δ
internal/helper/google.go	75.55% <75.55%> (ø)
main.go	73.51% <10.25%> (-4.38%)	⬇️

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