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/handlers/settings.go

@@ -2,7 +2,6 @@ package handlers
 
 // settings.go — User profile, preferences, and password management.
 //
-// v0.29.0: Raw SQL replaced with UserStore methods.
 
 import (
 	"context"