feat(1099): add payer EIN to ChurchProfile (entity, DTO, migration)

Add PayerEin (nullable string, max 20) to ChurchProfile entity, AppDbContext
config, ChurchProfileDto response, UpdateChurchProfileRequest, and
ChurchProfileService round-trip — mirroring the Phone/BankRoutingNumber
nullable-string pattern. Migration AddPayerEinToChurchProfile adds only the
one nullable column to ChurchProfiles.

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

API/ROLAC.API/DTOs/Disbursement/ChurchProfileDtos.cs

@@ -16,6 +16,7 @@ public class ChurchProfileDto
     public string? BankName          { get; set; }
     public string? BankAccountNumber { get; set; }
     public string? BankRoutingNumber { get; set; }
+    public string? PayerEin          { get; set; }
     public int     NextCheckNumber   { get; set; }
     public string  AiProvider         { get; set; } = "Claude";
     public string? ClaudeModel        { get; set; }
@@ -38,6 +39,7 @@ public class UpdateChurchProfileRequest
     [MaxLength(200)] public string? BankName { get; set; }
     [MaxLength(50)]  public string? BankAccountNumber { get; set; }
     [MaxLength(50)]  public string? BankRoutingNumber { get; set; }
+    [MaxLength(20)]  public string? PayerEin          { get; set; }
     [Range(1, int.MaxValue)] public int NextCheckNumber { get; set; }
     [MaxLength(20)]  public string  AiProvider   { get; set; } = "Claude";
     [MaxLength(100)] public string? ClaudeModel  { get; set; }

API/ROLAC.API/Data/AppDbContext.cs

@@ -393,6 +393,7 @@ public class AppDbContext : IdentityDbContext<AppUser, AppRole, string>
             entity.Property(e => e.BankName).HasMaxLength(200);
             entity.Property(e => e.BankAccountNumber).HasMaxLength(50);
             entity.Property(e => e.BankRoutingNumber).HasMaxLength(50);
+            entity.Property(e => e.PayerEin).HasMaxLength(20);
             entity.Property(e => e.NameZh).HasMaxLength(200);
             entity.Property(e => e.Phone).HasMaxLength(50);
             entity.Property(e => e.Email).HasMaxLength(200);

API/ROLAC.API/Entities/ChurchProfile.cs

@@ -21,6 +21,9 @@ public class ChurchProfile : AuditableEntity, IAuditable
     public string? BankAccountNumber { get; set; }
     public string? BankRoutingNumber { get; set; }
 
+    /// <summary>Payer EIN printed on Form 1099-NEC Copy B; the church's own public business identifier.</summary>
+    public string? PayerEin          { get; set; }
+
     // ── AI assist provider settings (editable via Church Profile → AI 設定 tab) ──
     public string  AiProvider   { get; set; } = "Claude";   // "Claude" | "Gemini"
     public string? ClaudeModel  { get; set; } = "claude-haiku-4-5-20251001";

API/ROLAC.API/Migrations/20260626012205_AddPayerEinToChurchProfile.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ROLAC.API.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddPayerEinToChurchProfile : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "PayerEin",
+                table: "ChurchProfiles",
+                type: "character varying(20)",
+                maxLength: 20,
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "PayerEin",
+                table: "ChurchProfiles");
+        }
+    }
+}

API/ROLAC.API/Migrations/AppDbContextModelSnapshot.cs

@@ -506,6 +506,10 @@ namespace ROLAC.API.Migrations
                     b.Property<int>("NextCheckNumber")
                         .HasColumnType("integer");
 
+                    b.Property<string>("PayerEin")
+                        .HasMaxLength(20)
+                        .HasColumnType("character varying(20)");
+
                     b.Property<string>("Phone")
                         .HasMaxLength(50)
                         .HasColumnType("character varying(50)");

API/ROLAC.API/Services/ChurchProfileService.cs

@@ -18,7 +18,7 @@ public class ChurchProfileService : IChurchProfileService
             Id = p.Id, Name = p.Name, NameZh = p.NameZh, Phone = p.Phone, Email = p.Email,
             Website = p.Website, Address = p.Address, City = p.City, State = p.State,
             ZipCode = p.ZipCode, BankName = p.BankName, BankAccountNumber = p.BankAccountNumber,
-            BankRoutingNumber = p.BankRoutingNumber, NextCheckNumber = p.NextCheckNumber,
+            BankRoutingNumber = p.BankRoutingNumber, PayerEin = p.PayerEin, NextCheckNumber = p.NextCheckNumber,
             AiProvider = p.AiProvider,
             ClaudeModel = p.ClaudeModel,
             ClaudeApiKeyMasked = Mask(p.ClaudeApiKey),
@@ -33,7 +33,7 @@ public class ChurchProfileService : IChurchProfileService
         p.Name = r.Name; p.NameZh = r.NameZh; p.Phone = r.Phone; p.Email = r.Email;
         p.Website = r.Website; p.Address = r.Address; p.City = r.City; p.State = r.State;
         p.ZipCode = r.ZipCode; p.BankName = r.BankName; p.BankAccountNumber = r.BankAccountNumber;
-        p.BankRoutingNumber = r.BankRoutingNumber; p.NextCheckNumber = r.NextCheckNumber;
+        p.BankRoutingNumber = r.BankRoutingNumber; p.PayerEin = r.PayerEin; p.NextCheckNumber = r.NextCheckNumber;
         p.AiProvider  = string.IsNullOrWhiteSpace(r.AiProvider) ? "Claude" : r.AiProvider;
         p.ClaudeModel = r.ClaudeModel;
         p.GeminiModel = r.GeminiModel;