fix: resolve Docker validation race conditions and sudo prefix bug

- Fix sudo prefix bug: Use word boundary matching to prevent 'do' keyword from matching 'docker' commands
- Add ensureProxyNetworksExist() helper to create networks before docker compose up
- Ensure networks exist synchronously before dispatching async proxy startup to prevent race conditions
- Update comprehensive unit tests for sudo parsing (50 tests passing)

This resolves issues where Docker commands failed to execute with sudo on non-root servers and where proxy networks were not created before the proxy container started.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/Jobs/ValidateAndInstallServerJob.php

@@ -168,6 +168,9 @@ class ValidateAndInstallServerJob implements ShouldQueue
             if (! $this->server->isBuildServer()) {
                 $proxyShouldRun = CheckProxy::run($this->server, true);
                 if ($proxyShouldRun) {
+                    // Ensure networks exist BEFORE dispatching async proxy startup
+                    // This prevents race condition where proxy tries to start before networks are created
+                    instant_remote_process(ensureProxyNetworksExist($this->server)->toArray(), $this->server, false);
                     StartProxy::dispatch($this->server);
                 }
             }