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/Actions/Proxy/StartProxy.php

@@ -75,6 +75,10 @@ class StartProxy
                 '    done',
                 "    echo 'Successfully stopped and removed existing coolify-proxy.'",
                 'fi',
+            ]);
+            // Ensure required networks exist BEFORE docker compose up (networks are declared as external)
+            $commands = $commands->merge(ensureProxyNetworksExist($server));
+            $commands = $commands->merge([
                 "echo 'Starting coolify-proxy.'",
                 'docker compose up -d --wait --remove-orphans',
                 "echo 'Successfully started coolify-proxy.'",