[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/Migrations/20260604142204_IngestProxy.cs

@@ -0,0 +1,40 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace JobsMedical.Web.Migrations
+{
+    /// <inheritdoc />
+    public partial class IngestProxy : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<bool>(
+                name: "IngestProxyEnabled",
+                table: "AppSettings",
+                type: "boolean",
+                nullable: false,
+                defaultValue: false);
+
+            migrationBuilder.AddColumn<string>(
+                name: "IngestProxyUrl",
+                table: "AppSettings",
+                type: "character varying(200)",
+                maxLength: 200,
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "IngestProxyEnabled",
+                table: "AppSettings");
+
+            migrationBuilder.DropColumn(
+                name: "IngestProxyUrl",
+                table: "AppSettings");
+        }
+    }
+}

src/JobsMedical.Web/Migrations/AppDbContextModelSnapshot.cs

@@ -83,6 +83,13 @@ namespace JobsMedical.Web.Migrations
                     b.Property<int>("IngestIntervalMinutes")
                         .HasColumnType("integer");
 
+                    b.Property<bool>("IngestProxyEnabled")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("IngestProxyUrl")
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)");
+
                     b.Property<bool>("MedjobsEnabled")
                         .HasColumnType("boolean");