Remove .well-known transport discovery - #4153
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Transport discovery used to be three steps - the MSC4143 transports endpoint, then .well-known, then app config. Upstream removed the middle one (element-hq#4153), and that middle one is the only one eledrone had: Dendrite answers 404 for the endpoint, and the SFU is advertised in .well-known. With the fallback gone there is nowhere left to find a transport, so no call connects at all. This is why calls broke the moment the app started embedding a widget built from this fork rather than the released 0.22.0 package - the release still has the .well-known step. The URL is the one .well-known already advertises. Remove this once the homeserver implements the transports endpoint, which is where upstream is going. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Calls stopped connecting the moment the app started embedding a widget built from our own fork rather than the released 0.22.0 package. Element Call finds its SFU by trying, in order: the MSC4143 transports endpoint, .well-known, then its own config. Upstream removed the .well-known step (element-hq/element-call#4153), and that step was the only one that worked here - Dendrite answers 404 for the transports endpoint, and the SFU is advertised in .well-known. So the fork's build had nowhere left to look while 0.22.0 still did. eledrone-call now puts livekit_service_url in the widget's own config.json, which is the surviving step. This picks that build up. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Blocked because depends on: #4135
Breaking for widget host that don't support MSC4515
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