Move ingestion + Telegram/Bale/Divar config to DB-backed admin settings

- AppSetting gains source config: AutoIngestEnabled, IngestIntervalMinutes, Telegram/Bale/Divar enabled+channels/token/queries
- IListingSource.FetchAsync(AppSetting) — sources read config from DB, not IOptions/appsettings; sample source dev-only
- IngestionWorker reads AutoIngest+interval from DB each cycle (toggle at runtime, no redeploy)
- /Admin/Settings gets a 'منابع جمع‌آوری' section; removed Ingestion env/appsettings + compose env vars
- ENV_FILE shrinks to HOST_PORT + POSTGRES_* + ADMIN_PHONE (AI + sources are all in-admin); migration

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/JobsMedical.Web/Pages/Admin/Index.cshtml

@@ -26,16 +26,10 @@
     <div class="layout-2">
         <aside class="card card-pad filter-card">
             <h3>موتور جمع‌آوری</h3>
-            <p class="muted" style="font-size:13px;">منابع متصل:</p>
-            <ul style="margin:0 0 12px; padding-inline-start:18px; font-size:13.5px;">
-                @foreach (var src in Model.Sources)
-                {
-                    <li>@src.Name —
-                        @if (src.Enabled) { <span style="color:var(--primary-dark);">فعال</span> }
-                        else { <span class="muted">غیرفعال (نیازمند تنظیمات)</span> }
-                    </li>
-                }
-            </ul>
+            <p class="muted" style="font-size:13px;">منابع: @string.Join("، ", Model.SourceNames)</p>
+            <p class="muted" style="font-size:12px; margin:0 0 12px;">
+                فعال/غیرفعال‌سازی و تنظیم کانال‌ها در <a asp-page="/Admin/Settings">تنظیمات</a>.
+            </p>
             <form method="post">
                 <button type="submit" asp-page-handler="RunIngestion" class="btn btn-accent btn-block">اجرای جمع‌آوری اکنون</button>
             </form>