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.cs

@@ -22,7 +22,7 @@ public class IndexModel : PageModel
 
     public List<RawListing> Queue { get; private set; } = new();
     public List<RawListing> Flagged { get; private set; } = new();
-    public IReadOnlyList<(string Name, bool Enabled)> Sources { get; private set; } = new List<(string, bool)>();
+    public IReadOnlyList<string> SourceNames { get; private set; } = new List<string>();
     public int PublishedShifts { get; private set; }
     public int PublishedJobs { get; private set; }
 
@@ -64,7 +64,7 @@ public class IndexModel : PageModel
         Flagged = await _db.RawListings
             .Where(r => r.Status == RawListingStatus.Flagged)
             .OrderByDescending(r => r.FetchedAt).ToListAsync();
-        Sources = _ingest.Sources;
+        SourceNames = _ingest.SourceNames;
         PublishedShifts = await _db.Shifts.CountAsync(s => s.Source != ShiftSource.Direct);
         PublishedJobs = await _db.JobOpenings.CountAsync();
     }