[Feature] fuzzy_storage: enhance blacklist handler with richer context

[Feature] fuzzy_storage: enhance blacklist handler with richer context

Pass extended information to Lua blacklist handlers:
- event_type: distinguish "new", "existing", or "blacklist" events
- ratelimit_info: bucket state (level, burst, rate, exceeded_by)
- digest: hash when session context is available
- extensions: domain and source IP from fuzzy extensions

Backwards compatible - existing handlers still receive ip and reason
as first two arguments. New arguments are optional for Lua handlers.

Optimized with early-exit checks when no handlers are registered.