Replace state blob with resource-oriented API endpoints

Split /api/v1/state into dedicated resource endpoints:
- /api/v1/operator, /api/v1/central-domain
- /api/v1/ddns/config, /api/v1/dns/settings
- /api/v1/dhcp/config (moved from /dnsmasq/dhcp/)
- /api/v1/nftables/config, /api/v1/haproxy/routes

Each page now talks to its own resource instead of deep-merging
a blob. Removes useConfig hook, CentralState type, and legacy
config methods.

web/src/hooks/index.ts

@@ -1,7 +1,6 @@
 export { useMessages } from './useMessages';
 export { useStatus } from './useStatus';
 export { useHealth } from './useHealth';
-export { useConfig } from './useConfig';
 export { useDnsmasq } from './useDnsmasq';
 export { useCentralStatus } from './useCentralStatus';
 export { useCloudflare } from './useCloudflare';

web/src/hooks/useConfig.ts

@@ -1,61 +0,0 @@
-import { useState, useEffect } from 'react';
-import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
-import { apiService } from '../services/api-legacy';
-import type { CentralState, CentralStateResponse } from '../types';
-
-interface CreateConfigResponse {
-  status: string;
-}
-
-/**
- * Hook for managing Wild Central runtime state
- * Endpoint: /api/v1/state
- * File: {dataDir}/state.yaml
- */
-export const useConfig = () => {
-  const queryClient = useQueryClient();
-  const [showConfigSetup, setShowConfigSetup] = useState(false);
-
-  const stateQuery = useQuery<CentralStateResponse>({
-    queryKey: ['state'],
-    queryFn: () => apiService.getConfig(),
-  });
-
-  // Update showConfigSetup based on query data
-  useEffect(() => {
-    if (stateQuery.data) {
-      setShowConfigSetup(stateQuery.data.configured === false);
-    }
-  }, [stateQuery.data]);
-
-  const createStateMutation = useMutation<CreateConfigResponse, Error, CentralState>({
-    mutationFn: (state) => apiService.createConfig(state),
-    onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['state'] });
-      setShowConfigSetup(false);
-    },
-  });
-
-  const updateStateMutation = useMutation<CreateConfigResponse, Error, CentralState>({
-    mutationFn: (state) => apiService.updateConfig(state),
-    onSuccess: () => {
-      queryClient.invalidateQueries({ queryKey: ['state'] });
-      // Immediately re-check daemon status so the pending-restart banner appears
-      queryClient.invalidateQueries({ queryKey: ['central', 'status'] });
-    },
-  });
-
-  return {
-    config: stateQuery.data?.state || null,
-    isConfigured: stateQuery.data?.configured || false,
-    showConfigSetup,
-    setShowConfigSetup,
-    isLoading: stateQuery.isLoading,
-    isCreating: createStateMutation.isPending,
-    isUpdating: updateStateMutation.isPending,
-    error: stateQuery.error || createStateMutation.error || updateStateMutation.error,
-    createConfig: createStateMutation.mutate,
-    updateConfig: updateStateMutation.mutateAsync,
-    refetch: stateQuery.refetch,
-  };
-};