DC-140: network provider abstraction (src/network/) + tailscale provider + registry + tests

dashcaddy-api/src/network/index.js

@@ -0,0 +1,24 @@
+/**
+ * src/network entry point (DC-140).
+ *
+ * Registers the built-in providers with the registry on first require.
+ * The WireGuard provider (DC-149) registers itself here when it lands.
+ *
+ * Usage (feature modules — the ONLY sanctioned import):
+ *   const { registry } = require('../network');
+ *   const provider = registry.getActiveProvider(); // throws if unset
+ *   if (registry.getCapabilities().invites) { ... }
+ */
+
+'use strict';
+
+const registry = require('./registry');
+const { createTailscaleProvider } = require('./providers/tailscale');
+
+registry.registerProvider('tailscale', createTailscaleProvider);
+
+module.exports = {
+  registry,
+  errors: require('./errors'),
+  CONTRACT_METHODS: require('./provider').CONTRACT_METHODS,
+};