switched rover <-> server streams to rtsptcp, and moved mediamtx to be a server owned and configured child process!

server/scripts/validateMediaMtxConfig.js

@@ -0,0 +1,21 @@
+#!/usr/bin/env node
+// MediaMTX Configuration Validator
+// Purpose: Lets the installer validate server-owned MediaMTX inputs before disabling the legacy service.
+// Scope: Builds and serializes the runtime YAML without starting MediaMTX or changing external state.
+const yaml = require('js-yaml');
+const { loadConfig } = require('../src/helpers/configLoader');
+const { buildMediaMtxConfig } = require('../src/services/mediaMtxService/config');
+
+const config = loadConfig();
+const generated = buildMediaMtxConfig({
+  config,
+  serverPort: process.env.PORT || 8080,
+  snapshotWriterPath: process.env.ROVER_SNAPSHOT_WRITER_BIN || '/usr/local/bin/rover-snapshot-writer.sh',
+});
+
+/*
+  Serializing is part of validation: it catches values that the builder accepted but js-yaml
+  cannot represent before the installer removes the previous service configuration.
+*/
+yaml.dump(generated, { noRefs: true, lineWidth: 120 });
+process.stdout.write('MediaMTX server configuration is valid\n');