feat(gateway): add optional bonjour/mdns discovery

src/config/schema.ts

@@ -32,6 +32,17 @@ const wsRateLimitSchema = z.object({
   violation_window_ms: z.number().min(1000).max(60000).default(10000),
 }).default({});
 
+const serverDiscoverySchema = z.object({
+  /** Enable local-network service discovery (mDNS/Bonjour advertisement). */
+  enabled: z.boolean().default(false),
+  /** Service instance name advertised on LAN. */
+  service_name: z.string().min(1).default('flynn-gateway'),
+  /** mDNS service type. */
+  service_type: z.string().min(1).default('_flynn._tcp'),
+  /** Additional TXT metadata advertised with the service record. */
+  txt: z.record(z.string(), z.string()).default({}),
+}).default({});
+
 const serverSchema = z.object({
   tailscale: tailscaleSchema,
   localhost: z.boolean().default(true),
@@ -48,6 +59,8 @@ const serverSchema = z.object({
   max_request_body_bytes: z.number().min(1024).max(10 * 1024 * 1024).default(1_048_576),
   /** Per-connection WebSocket ingress rate limit settings. */
   ws_rate_limit: wsRateLimitSchema,
+  /** Optional Bonjour/mDNS advertisement settings. */
+  discovery: serverDiscoverySchema,
 });
 
 /** All supported model provider identifiers. Used by the config schema and TUI autocompletion. */