feat(sms): bring-your-own-provider — cafés use their own SMS account

The platform no longer sells SMS. Each café saves its OWN Kavenegar API
key + sender line (new Cafes columns + migration) and campaigns are sent
and billed through that account.

Backend:
- GET/PUT /sms/settings (Manager/Owner; key echoed masked, verified
  against the provider before saving)
- campaign + balance use the café's credentials; SMS_NOT_CONFIGURED
  error when missing; plan-tier SMS gating removed everywhere
  (PlanLimitChecker, SmsMarketingService, billing status)
- platform Kavenegar config stays ONLY for login OTPs (env/DB)
- design-time DbContext factory so `dotnet ef migrations add` works
  without booting the host

Dashboard:
- SMS screen: provider-settings card, not-configured callout, campaign
  form disabled until configured; quota bar removed (usage stays as info)
- subscription screen + plan comparison no longer show SMS limits

Admin panel:
- Kavenegar/SMS section removed from integrations (request field now
  optional; stored OTP config untouched)
- SMS limit field removed from the plan editor
- nav label "درگاه و پیامک" → "درگاه پرداخت و AI"

fa/en/ar translations. 86 tests pass; all tsc clean.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/Meezi.API/Controllers/SmsController.cs

@@ -7,33 +7,64 @@ using Meezi.Shared;
 
 namespace Meezi.API.Controllers;
 
+/// <summary>
+/// Marketing SMS — bring-your-own-provider. Each café configures its OWN
+/// Kavenegar API key + sender line; the platform does not sell SMS.
+/// </summary>
 [Route("api/cafes/{cafeId}/sms")]
 public class SmsController : CafeApiControllerBase
 {
     private readonly ISmsMarketingService _smsMarketingService;
-    private readonly ISmsService _smsService;
     private readonly IValidator<SendSmsCampaignRequest> _campaignValidator;
 
     public SmsController(
         ISmsMarketingService smsMarketingService,
-        ISmsService smsService,
         IValidator<SendSmsCampaignRequest> campaignValidator)
     {
         _smsMarketingService = smsMarketingService;
-        _smsService = smsService;
         _campaignValidator = campaignValidator;
     }
 
+    [HttpGet("settings")]
+    public async Task<IActionResult> GetSettings(string cafeId, ITenantContext tenant, CancellationToken cancellationToken)
+    {
+        if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
+        if (EnsureManager(tenant) is { } forbidden) return forbidden;
+
+        var data = await _smsMarketingService.GetSettingsAsync(cafeId, cancellationToken);
+        return Ok(new ApiResponse<SmsSettingsDto>(true, data));
+    }
+
+    [HttpPut("settings")]
+    public async Task<IActionResult> UpdateSettings(
+        string cafeId,
+        [FromBody] UpdateSmsSettingsRequest request,
+        ITenantContext tenant,
+        CancellationToken cancellationToken)
+    {
+        if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
+        if (EnsureManager(tenant) is { } forbidden) return forbidden;
+
+        var (success, data, code, message) = await _smsMarketingService.UpdateSettingsAsync(
+            cafeId, request, cancellationToken);
+        if (!success)
+        {
+            return code switch
+            {
+                "NOT_FOUND" => NotFound(new ApiResponse<object>(false, null, new ApiError(code, message!))),
+                _ => BadRequest(new ApiResponse<object>(false, null, new ApiError(code!, message!)))
+            };
+        }
+
+        return Ok(new ApiResponse<SmsSettingsDto>(true, data));
+    }
+
     [HttpGet("balance")]
     public async Task<IActionResult> GetBalance(string cafeId, ITenantContext tenant, CancellationToken cancellationToken)
     {
         if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
 
-        var info = await _smsService.GetAccountInfoAsync(cancellationToken);
-        var dto = info is not null
-            ? new SmsBalanceDto(info.RemainCredit, info.AccountType, true)
-            : new SmsBalanceDto(0, "master", false);
-
+        var dto = await _smsMarketingService.GetBalanceAsync(cafeId, cancellationToken);
         return Ok(new ApiResponse<SmsBalanceDto>(true, dto));
     }
 
@@ -41,10 +72,8 @@ public class SmsController : CafeApiControllerBase
     public async Task<IActionResult> GetUsage(string cafeId, ITenantContext tenant, CancellationToken cancellationToken)
     {
         if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
-        if (tenant.PlanTier is null)
-            return BadRequest(new ApiResponse<object>(false, null, new ApiError("INVALID", "Plan tier missing.")));
 
-        var data = await _smsMarketingService.GetUsageAsync(cafeId, tenant.PlanTier.Value, cancellationToken);
+        var data = await _smsMarketingService.GetUsageAsync(cafeId, cancellationToken);
         return Ok(new ApiResponse<SmsUsageDto>(true, data));
     }
 
@@ -56,20 +85,18 @@ public class SmsController : CafeApiControllerBase
         CancellationToken cancellationToken)
     {
         if (EnsureCafeAccess(cafeId, tenant) is { } denied) return denied;
-        if (tenant.PlanTier is null)
-            return BadRequest(new ApiResponse<object>(false, null, new ApiError("INVALID", "Plan tier missing.")));
 
         var validation = await _campaignValidator.ValidateAsync(request, cancellationToken);
         if (!validation.IsValid) return BadRequest(ValidationError(validation));
 
         var (success, data, code, message) = await _smsMarketingService.SendCampaignAsync(
-            cafeId, tenant.PlanTier.Value, request, cancellationToken);
+            cafeId, request, cancellationToken);
 
         if (!success)
         {
             return code switch
             {
-                "PLAN_LIMIT_REACHED" => StatusCode(StatusCodes.Status403Forbidden,
+                "SMS_NOT_CONFIGURED" => BadRequest(
                     new ApiResponse<object>(false, null, new ApiError(code, message!))),
                 "NOT_FOUND" => NotFound(new ApiResponse<object>(false, null, new ApiError(code, message!))),
                 _ => BadRequest(new ApiResponse<object>(false, null, new ApiError(code!, message!)))