feat(activesync): horde-activesync summary and show

[TDannhauer]

Parent

Epic: horde/ActiveSync#99
Depends on: horde/Core#216
Design: horde/ActiveSync doc/ops-monitor.md (§6.2–6.3, Issue C)

Summary

Standalone CLI binary horde-activesync in horde/base bin/ (same family as horde-active-sessions), not a hordectl command.

Initial subcommands:

• horde-activesync summary — fleet counters; cron/nagios-friendly exit codes
• horde-activesync show USER DEVICE — full device snapshot (collections + signals)

Options: --format=table|json, filters as designed. Composer bin entry.

Exit codes (summary)

Code	Meaning
0	no critical
1	≥1 critical
2	ActiveSync unavailable / config error

Acceptance

• summary usable as cron health check
• show prints collections + signals (+ log path hint when available)
• No mutation flags (no wipe/block in v1)
• Bootstraps like other horde/base CLI bins (appInit, auth none, cli true)
• Help text present

Supersedes

horde/hordectl#20 (wrong home — closed)