Replace InstanceConfig with DNSEntry for dnsmasq config generation

InstanceConfig was a ~50-field struct designed for Wild Cloud k8s instances,
but only 3 fields were ever read by dnsmasq (the sole consumer). The
reconciliation bridge constructed fake InstanceConfig objects from registered
domains just to satisfy this interface.

Replace with DNSEntry{Domain, IP} — a 2-field struct purpose-built for
dnsmasq. All domains get local=/ directives to prevent AAAA queries from
leaking to upstream DNS (Happy Eyeballs / RFC 8305 latency on LAN).

Removed dead code: InstanceConfig, NodeConfig, LoadCloudConfig,
SaveCloudConfig, DeepMerge, LoadMergedInstanceConfig, EnsureInstanceConfig,
instance path helpers, instanceLoadBalancerIP, GenerateInstanceConfig,
and all modular per-instance dnsmasq methods.

web/src/types/index.ts

@@ -5,73 +5,6 @@ export interface Status {
   timestamp: string;
 }
 
-// ========================================
-// Instance Config Types (Wild Cloud instance level)
-// Endpoint: /api/v1/instances/{name}/config
-// File: {dataDir}/instances/{name}/config.yaml
-// ========================================
-
-export interface NodeConfig {
-  role: string;
-  interface: string;
-  disk: string;
-  currentIp: string;
-}
-
-export interface InstanceConfig {
-  operator?: {
-    email?: string;
-  };
-  cloud?: {
-    baseDomain?: string;
-    domain?: string;
-    internalDomain?: string;
-    dhcpRange?: string;
-    nfs?: {
-      host?: string;
-      mediaPath?: string;
-      storageCapacity?: string;
-    };
-    dockerRegistryHost?: string;
-  };
-  cluster?: {
-    name?: string;
-    loadBalancerIp?: string;
-    ipAddressPool?: string;
-    hostnamePrefix?: string;
-    certManager?: {
-      cloudflare?: {
-        domain?: string;
-      };
-    };
-    externalDns?: {
-      ownerId?: string;
-    };
-    internalDns?: {
-      externalResolver?: string;
-    };
-    dockerRegistry?: {
-      storage?: string;
-    };
-    nodes?: {
-      talos?: {
-        version?: string;
-        schematicId?: string;
-      };
-      control?: {
-        vip?: string;
-      };
-      active?: Record<string, NodeConfig>;
-    };
-  };
-  apps?: Record<string, Record<string, unknown>>; // Each app has its own dynamic config
-}
-
-export interface InstanceConfigResponse {
-  config?: InstanceConfig;
-  message?: string;
-}
-
 export interface Message {
   message: string;
   type: 'info' | 'success' | 'error';
@@ -100,7 +33,7 @@ export interface DnsmasqStatus {
   pid: number;
   ip: string;
   config_file: string;
-  instances_configured: number;
+  domains_configured: number;
   last_restart: string;
 }