Adds an "Alerts" card to /slm/{id}: lists rules and a create/edit/delete form
(simple-first — "Alert when [Leq] is [above] [65] dB for [N] s", optional
time-of-day window + day picker, advanced hysteresis/cooldown collapsed). Talks
to the existing SLMM alert CRUD via the proxy (/api/slmm/{unit}/alerts/rules);
no SLMM changes. Rule changes invalidate the evaluator's cache server-side.
Verified: alerts script JS balances, slm_detail.html parses, and the TV proxy
forwards method + JSON body + query params for POST/PUT/DELETE.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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