feat(admin): add never-subscribed broadcast target with audience counts

Add a broadcast audience for users who registered but never had any subscription or trial (no Subscription rows at all), backed by a new get_user_ids_without_any_subscription DAL helper and a 'never' target in the webapp broadcast route.

Add GET /api/admin/broadcast/audience-counts so the audience dropdown shows the recipient count next to each option, with graceful fallback when counts are unavailable.

frontend/src/admin/sections/BroadcastSection.svelte

@@ -1,16 +1,27 @@
 <script>
   import { Textarea } from "$components/ui/index.js";
   import { Send } from "$components/ui/icons.js";
-  import { getContext } from "svelte";
+  import { getContext, onMount } from "svelte";
   import { Label } from "$components/ui/primitives.js";
   import { AdminButton, AdminSelect } from "$components/patterns/admin/index.js";
 
   export let at;
   const broadcastStore = getContext("broadcastStore");
 
-  $: ({ broadcastTarget, broadcastText, broadcastBusy, broadcastResult } = $broadcastStore);
+  $: ({ broadcastTarget, broadcastText, broadcastBusy, broadcastResult, broadcastCounts } =
+    $broadcastStore);
 
   const BROADCAST_TARGET_OPTIONS = broadcastStore.BROADCAST_TARGET_OPTIONS;
+
+  // Append the resolved audience size to each option once counts are loaded.
+  $: targetOptions = BROADCAST_TARGET_OPTIONS.map((option) => {
+    const count = broadcastCounts?.[option.value];
+    return count == null ? option : { ...option, label: `${option.label} (${count})` };
+  });
+
+  onMount(() => {
+    broadcastStore.loadCounts();
+  });
 </script>
 
 <div class="admin-card">
@@ -24,7 +35,7 @@
         <span>{at("broadcast_label_audience", {}, "Аудитория")}</span>
         <AdminSelect
           value={broadcastTarget}
-          items={BROADCAST_TARGET_OPTIONS}
+          items={targetOptions}
           ariaLabel={at("broadcast_label_audience", {}, "Аудитория")}
           onValueChange={(value) => broadcastStore.updateField({ broadcastTarget: value })}
         />

frontend/src/lib/admin/stores/broadcastStore.js

@@ -6,6 +6,7 @@ export function createBroadcastStore({ api, onToast, at }) {
     broadcastText: "",
     broadcastBusy: false,
     broadcastResult: null,
+    broadcastCounts: null,
   });
 
   const BROADCAST_TARGET_OPTIONS = [
@@ -13,8 +14,23 @@ export function createBroadcastStore({ api, onToast, at }) {
     { value: "active", label: at("broadcast_target_active", {}, "С подпиской") },
     { value: "inactive", label: at("broadcast_target_inactive", {}, "Без подписки") },
     { value: "expired", label: at("broadcast_target_expired", {}, "Expired subscription") },
+    {
+      value: "never",
+      label: at("broadcast_target_never", {}, "Без подписки и без истории"),
+    },
   ];
 
+  async function loadCounts() {
+    try {
+      const res = await api("/admin/broadcast/audience-counts");
+      if (res?.ok && res.counts) {
+        state.update((s) => ({ ...s, broadcastCounts: res.counts }));
+      }
+    } catch {
+      // Counts are advisory; ignore failures and keep plain labels.
+    }
+  }
+
   async function runBroadcast() {
     let text = "";
     let target = "";
@@ -56,6 +72,7 @@ export function createBroadcastStore({ api, onToast, at }) {
     update: state.update,
     runBroadcast,
     updateField,
+    loadCounts,
     BROADCAST_TARGET_OPTIONS,
   };
 }

frontend/src/lib/webapp/mockApi.js

@@ -658,6 +658,12 @@ function demoApiResponse(path, cleanPath, options, context) {
   const params = queryParams(path);
 
   if (cleanPath === "/admin/stats") return clone(DEMO_DATASET.stats);
+  if (cleanPath === "/admin/broadcast/audience-counts") {
+    return {
+      ok: true,
+      counts: { all: 1280, active: 742, inactive: 538, expired: 311, never: 227 },
+    };
+  }
   if (cleanPath === "/admin/sync") return { ok: true, status: "queued" };
 
   if (cleanPath === "/admin/payments") {