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/Program.cs

@@ -28,14 +28,6 @@ builder.Services.AddHttpClient("scrape", c =>
     c.DefaultRequestHeaders.UserAgent.ParseAdd("Mozilla/5.0 (compatible; HamkadrBot/1.0)");
 });
 builder.Services.AddHttpClient("ai");
-builder.Services.Configure<JobsMedical.Web.Services.Scraping.IngestionOptions>(
-    builder.Configuration.GetSection("Ingestion"));
-builder.Services.Configure<JobsMedical.Web.Services.Scraping.TelegramOptions>(
-    builder.Configuration.GetSection("Ingestion:Telegram"));
-builder.Services.Configure<JobsMedical.Web.Services.Scraping.BaleOptions>(
-    builder.Configuration.GetSection("Ingestion:Bale"));
-builder.Services.Configure<JobsMedical.Web.Services.Scraping.DivarOptions>(
-    builder.Configuration.GetSection("Ingestion:Divar"));
 builder.Services.AddSingleton<JobsMedical.Web.Services.Scraping.ListingValidator>();
 builder.Services.AddSingleton<JobsMedical.Web.Services.Scraping.IAiAuditor,
     JobsMedical.Web.Services.Scraping.OpenAiCompatibleAuditor>();