[Ingest] Route scraping through an optional V2Ray/Xray proxy (Telegram in Iran)

Telegram and some sources are filtered in Iran. .NET cannot speak vmess/vless/trojan, so add an Xray sidecar (compose service 'xray', behind the 'proxy' profile) that converts the admin's config into a local SOCKS5 proxy (xray:10808). New ScrapeHttpClients provider builds a proxied or direct HttpClient (WebProxy supports socks5/socks4/http) cached per proxy URL; all five ingestion sources (Telegram/Bale/Divar/Medjobs/Websites) now use it. Admin settings gain IngestProxyEnabled + IngestProxyUrl (migration; UI under sources). Added deploy/xray/config.json template + README with vmess/vless/trojan examples.

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

src/JobsMedical.Web/Services/Scraping/DivarListingSource.cs

@@ -12,12 +12,12 @@ namespace JobsMedical.Web.Services.Scraping;
 public class DivarListingSource : IListingSource
 {
     private const string BaseUrl = "https://api.divar.ir/v8/web-search";
-    private readonly IHttpClientFactory _http;
+    private readonly ScrapeHttpClients _clients;
     private readonly ILogger<DivarListingSource> _log;
 
-    public DivarListingSource(IHttpClientFactory http, ILogger<DivarListingSource> log)
+    public DivarListingSource(ScrapeHttpClients clients, ILogger<DivarListingSource> log)
     {
-        _http = http;
+        _clients = clients;
         _log = log;
     }
 
@@ -29,7 +29,7 @@ public class DivarListingSource : IListingSource
         if (!s.DivarEnabled || queries.Count == 0) return Array.Empty<ScrapedItem>();
         var city = string.IsNullOrWhiteSpace(s.DivarCity) ? "tehran" : s.DivarCity.Trim();
 
-        var client = _http.CreateClient("scrape");
+        var client = _clients.For(s);
         var items = new List<ScrapedItem>();
         foreach (var q in queries)
         {