feat(analytics): optional bot filtering via isbot (SKIP_BOTS=false by default) #938
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What
Add an opt-in flag to skip inserting analytics rows for obvious bots. Uses isbot to detect common crawlers.
Default
SKIP_BOTS=false (no behaviour change).
How
Normal user traffic unchanged.
Why
Reduces analytics noise without affecting redirects or link counters.
Note: This PR branch off PR #937 (ua-parser swap).