Route non-local SDS via Brew presence query

[GhostBassist]

Summary

• remove the hardcoded TetraPack SDS service ISSI whitelist
• route non-local SDS and SDS-STATUS through a Brew subscriber presence query
• only forward SDS to Brew when the returned subscriber profile has status == 1
• drop unroutable destinations with an explicit log message

Details

This changes SDS routing from a fixed ISSI allowlist to a Brew-driven presence check.

Local ISSI and local GSSI handling are unchanged.
For non-local ISSIs, CMCE now hands the message to Brew, Brew sends a 0xf4 service query, and queued SDS is only released when the matching subscriber profile response reports status: 1.

If no routable external subscriber is confirmed, the message is dropped with:
ISSI (<number>) is not Routeable Locally or Externally, Dropping

Validation

• cargo fmt --all
• cargo test -p tetra-entities --lib -- --nocapture
• cargo test -p tetra-entities --test test_sds_bs -- --nocapture