chore: strip pre-fork version comments across 72 files

Removes standalone "// v0.X.X:" comment lines and inline trailing
version annotations. Keeps version references in config field docs
and compatibility notes where they describe requirements.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/store/postgres/ratelimit.go

@@ -7,7 +7,6 @@ import (
 )
 
 // RateLimitStore manages distributed rate limit counters in Postgres.
-// v0.32.0: fixed-window counter — upsert per-second bucket, check burst.
 type RateLimitStore struct{}
 
 func NewRateLimitStore() *RateLimitStore { return &RateLimitStore{} }