feat(ministry): add Ministry entity, seed (10), and read endpoint

API/ROLAC.API/Data/AppDbContext.cs

@@ -14,6 +14,7 @@ public class AppDbContext : IdentityDbContext<AppUser, AppRole, string>
     public DbSet<GivingCategory>  GivingCategories  => Set<GivingCategory>();
     public DbSet<OfferingSession> OfferingSessions  => Set<OfferingSession>();
     public DbSet<Giving>          Givings           => Set<Giving>();
+    public DbSet<Ministry>        Ministries        => Set<Ministry>();
 
     protected override void OnModelCreating(ModelBuilder builder)
     {
@@ -142,5 +143,12 @@ public class AppDbContext : IdentityDbContext<AppUser, AppRole, string>
             entity.HasOne(e => e.OfferingSession).WithMany(s => s.Givings)
                   .HasForeignKey(e => e.OfferingSessionId).OnDelete(DeleteBehavior.Cascade);
         });
+
+        // ── Ministry ─────────────────────────────────────────────────────────
+        builder.Entity<Ministry>(entity =>
+        {
+            entity.Property(e => e.Name_en).HasMaxLength(200).IsRequired();
+            entity.Property(e => e.Name_zh).HasMaxLength(200);
+        });
     }
 }

API/ROLAC.API/Data/DbSeeder.cs

@@ -15,6 +15,20 @@ public static class DbSeeder
         ("Mission",          "宣教奉獻", 5),
     ];
 
+    private static readonly (string En, string Zh, int Sort)[] MinistrySeed =
+    [
+        ("Administration", "行政",     1),
+        ("Preaching",      "講道",     2),
+        ("Emcee",          "司會",     3),
+        ("Worship",        "敬拜",     4),
+        ("PPT/Media",      "PPT/影音", 5),
+        ("Sound",          "音控",     6),
+        ("Facility",       "場地組",   7),
+        ("Hospitality",    "招待",     8),
+        ("Children",       "兒牧",     9),
+        ("Catering",       "餐飲",    10),
+    ];
+
     private static readonly (string Name, string Description)[] Roles =
     [
         ("super_admin",     "System administrator — full access"),
@@ -66,6 +80,16 @@ public static class DbSeeder
         await db.SaveChangesAsync();
     }
 
+    public static async Task SeedMinistriesAsync(AppDbContext db)
+    {
+        foreach (var (en, zh, sort) in MinistrySeed)
+        {
+            if (!await db.Ministries.AnyAsync(m => m.Name_en == en))
+                db.Ministries.Add(new Ministry { Name_en = en, Name_zh = zh, SortOrder = sort, IsActive = true });
+        }
+        await db.SaveChangesAsync();
+    }
+
     /// <summary>
     /// Seeds roles and (in Development) the default admin account.
     /// Called once on application startup after migrations have been applied.
@@ -80,6 +104,7 @@ public static class DbSeeder
 
         var db = services.GetRequiredService<AppDbContext>();
         await SeedGivingCategoriesAsync(db);
+        await SeedMinistriesAsync(db);
 
         if (env.IsDevelopment())
             await SeedAdminUserAsync(userManager);