Aggiunge registry nodi stream e provisioning Hetzner/lab per lo scale-out.

Prepara l'architettura multi-nodo (MediaMTX+ffmpeg) con assignment URL per sessione, admin di provision/drain e provider Cloud/DNS astratti verso mltv-stream.net.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/spec/models/stream_session_node_spec.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe StreamSession do
+  it "builds ingest/hls URLs from the assigned stream node" do
+    node = StreamNode.create!(
+      slug: "ingest-01",
+      hostname: "ingest-01.mltv-stream.net",
+      role: "cloud",
+      status: "ready",
+      provider: "hetzner",
+      rtmp_base_url: "rtmp://ingest-01.mltv-stream.net:1935",
+      hls_base_url: "https://ingest-01.mltv-stream.net/hls",
+      api_base_url: "http://10.0.0.2:9997",
+      internal_rtmp_url: "rtmp://10.0.0.2:1935",
+      max_publishers: 4,
+      max_relays: 4
+    )
+    user = User.create!(email: "s@example.com", name: "S", password: "Password123", role: "coach")
+    club = Club.create!(name: "Club", sport: "volleyball")
+    team = club.teams.create!(name: "Team", sport: "volleyball", slug: "team-url")
+    match = team.matches.create!(opponent_name: "Opp", scheduled_at: 1.hour.from_now)
+    session = StreamSession.create!(
+      match: match, user: user, platform: "matchlivetv", status: "idle", stream_node: node
+    )
+
+    expect(session.rtmp_ingest_url).to eq(
+      "rtmp://ingest-01.mltv-stream.net:1935/live/match_#{session.id}"
+    )
+    expect(session.hls_playback_url).to eq(
+      "https://ingest-01.mltv-stream.net/hls/live/match_#{session.id}/index.m3u8"
+    )
+    expect(session.mediamtx_api_base_url).to eq("http://10.0.0.2:9997")
+    expect(session.mediamtx_internal_rtmp_url).to eq("rtmp://10.0.0.2:1935")
+  end
+end