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/Services/Scraping/IngestionService.cs

@@ -43,8 +43,7 @@ public class IngestionService
         _ai = ai; _settings = settings; _log = log;
     }
 
-    public IReadOnlyList<(string Name, bool Enabled)> Sources =>
-        _sources.Select(s => (s.Name, s.Enabled)).ToList();
+    public IReadOnlyList<string> SourceNames => _sources.Select(s => s.Name).ToList();
 
     public async Task<IngestionSummary> RunAsync(CancellationToken ct = default)
     {
@@ -58,12 +57,13 @@ public class IngestionService
 
         var results = new List<SourceResult>();
 
-        foreach (var source in _sources.Where(s => s.Enabled))
+        foreach (var source in _sources)
         {
             int fetched = 0, queued = 0, published = 0, flagged = 0, spam = 0, dupes = 0;
             IReadOnlyList<ScrapedItem> items;
-            try { items = await source.FetchAsync(ct); }
+            try { items = await source.FetchAsync(settings, ct); }
             catch (Exception ex) { _log.LogError(ex, "Source {Source} failed", source.Name); continue; }
+            if (items.Count == 0) continue;   // disabled/unconfigured source
 
             foreach (var item in items)
             {