[Alerts] Customizable job alerts + Help capabilities showcase

Job alerts (هشدار شغلی): users save what they want — scope (shift/job/both), role, city, shift type, employment type, minimum pay — and get notified when an employer posts a match. New JobAlert model + AlertScope enum + DbContext (user-cascade, role set-null, IsActive index) + migration. /Me/Alerts page to create/pause/delete alerts; entry point added to the کارجو panel. NotificationService.NotifyNewShift/Job now unions preference matches with active-alert matches (deduped) so alert owners are notified on publish. Help page gains an 'امکانات همکادر' capability showcase grid (with a 'ساخت هشدار شغلی' CTA) so the page demonstrates what the app does.

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

src/JobsMedical.Web/Migrations/20260604144346_JobAlerts.cs

@@ -0,0 +1,83 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace JobsMedical.Web.Migrations
+{
+    /// <inheritdoc />
+    public partial class JobAlerts : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "JobAlerts",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    UserId = table.Column<int>(type: "integer", nullable: false),
+                    Label = table.Column<string>(type: "character varying(120)", maxLength: 120, nullable: true),
+                    Scope = table.Column<int>(type: "integer", nullable: false),
+                    RoleId = table.Column<int>(type: "integer", nullable: true),
+                    CityId = table.Column<int>(type: "integer", nullable: true),
+                    DistrictId = table.Column<int>(type: "integer", nullable: true),
+                    ShiftType = table.Column<int>(type: "integer", nullable: true),
+                    EmploymentType = table.Column<int>(type: "integer", nullable: true),
+                    MinPay = table.Column<long>(type: "bigint", nullable: true),
+                    IsActive = table.Column<bool>(type: "boolean", nullable: false),
+                    CreatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_JobAlerts", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_JobAlerts_Cities_CityId",
+                        column: x => x.CityId,
+                        principalTable: "Cities",
+                        principalColumn: "Id");
+                    table.ForeignKey(
+                        name: "FK_JobAlerts_Roles_RoleId",
+                        column: x => x.RoleId,
+                        principalTable: "Roles",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.SetNull);
+                    table.ForeignKey(
+                        name: "FK_JobAlerts_Users_UserId",
+                        column: x => x.UserId,
+                        principalTable: "Users",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_JobAlerts_CityId",
+                table: "JobAlerts",
+                column: "CityId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_JobAlerts_IsActive",
+                table: "JobAlerts",
+                column: "IsActive");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_JobAlerts_RoleId",
+                table: "JobAlerts",
+                column: "RoleId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_JobAlerts_UserId",
+                table: "JobAlerts",
+                column: "UserId");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "JobAlerts");
+        }
+    }
+}

src/JobsMedical.Web/Migrations/AppDbContextModelSnapshot.cs

@@ -438,6 +438,61 @@ namespace JobsMedical.Web.Migrations
                     b.ToTable("InterestEvents");
                 });
 
+            modelBuilder.Entity("JobsMedical.Web.Models.JobAlert", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<int?>("CityId")
+                        .HasColumnType("integer");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<int?>("DistrictId")
+                        .HasColumnType("integer");
+
+                    b.Property<int?>("EmploymentType")
+                        .HasColumnType("integer");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Label")
+                        .HasMaxLength(120)
+                        .HasColumnType("character varying(120)");
+
+                    b.Property<long?>("MinPay")
+                        .HasColumnType("bigint");
+
+                    b.Property<int?>("RoleId")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("Scope")
+                        .HasColumnType("integer");
+
+                    b.Property<int?>("ShiftType")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("UserId")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CityId");
+
+                    b.HasIndex("IsActive");
+
+                    b.HasIndex("RoleId");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("JobAlerts");
+                });
+
             modelBuilder.Entity("JobsMedical.Web.Models.JobOpening", b =>
                 {
                     b.Property<int>("Id")
@@ -993,6 +1048,30 @@ namespace JobsMedical.Web.Migrations
                     b.Navigation("Visitor");
                 });
 
+            modelBuilder.Entity("JobsMedical.Web.Models.JobAlert", b =>
+                {
+                    b.HasOne("JobsMedical.Web.Models.City", "City")
+                        .WithMany()
+                        .HasForeignKey("CityId");
+
+                    b.HasOne("JobsMedical.Web.Models.Role", "Role")
+                        .WithMany()
+                        .HasForeignKey("RoleId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.HasOne("JobsMedical.Web.Models.User", "User")
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("City");
+
+                    b.Navigation("Role");
+
+                    b.Navigation("User");
+                });
+
             modelBuilder.Entity("JobsMedical.Web.Models.JobOpening", b =>
                 {
                     b.HasOne("JobsMedical.Web.Models.Facility", "Facility")