multistreaming: scenes/composition, installer build support, service updates

- multistreaming (new): RTMP ingest + multi-platform fan-out with pluggable providers (Twitch/YouTube/Kick/custom), zero-knowledge key vaults, Authelia OIDC auth, shared rooms with editor/streamer roles, single-use invites, per-account streaming grants, and scenes & composition (grid/PiP layouts, text/image overlays, per-output audio routing).
- installer: support Dockerfile build in metadata (not just image) and RSA key generation for the Authelia OIDC JWKS.
- authelia: add OIDC provider with portainer + multistreaming clients (public + PKCE).
- services: remove allprox; add nginx-proxy-manager and portainer; update lldap; regenerate catalog.

installer/src/github.ts

@@ -160,6 +160,13 @@ function walk(base: string, rel: string, out: ServiceFile[]): void {
     return;
   }
   for (const e of entries) {
+    // Never copy dependency dirs, build output, or VCS metadata into the deploy/build context.
+    if (
+      e.isDirectory() &&
+      (e.name === "node_modules" || e.name === "dist" || e.name === ".git")
+    ) {
+      continue
+    }
     const relPath = rel ? `${rel}/${e.name}` : e.name;
     if (e.isDirectory()) {
       walk(base, relPath, out);