Configuring Channel Settings

Configure settings on an already-existing Enhanced `MessagingChannel` (any type — WhatsApp, Text/SMS, LINE, Apple, Facebook, EmbeddedMessaging), given its `{CHANNEL_ID}`. Covers five facets: consent (ConsentType + per-language keyword records), automated responses, messaging keywords, session-inactivity timeouts, and pre-chat parameters. Consent + a matching language-keyword record are required for activation's readiness check. TRIGGER when setting or changing settings on a channel that already exists (opt-out keyword, consent type, double opt-in confirmation, initial/help auto-responses, OptIn/OptOut keywords, session-inactivity timeout) — typically between insertion/rou…