fix(sms): stop sending platform to the relay gateway

With platform "kave" (Kavenegar) the gateway answered "cURL library is not
loaded" and nothing was delivered. The body is now { phone, host, text } and
the gateway picks the line itself. SMS_RELAY_PLATFORM is removed from the
driver, docker-compose and the env examples.

Tests: sms.service.spec updated. 150 tests pass.

پیامک بدون انتخاب خط کاوه‌نگار فرستاده می‌شود و سرویس پیامک خودش خط را انتخاب می‌کند.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/modules/sms/drivers/relay.driver.ts

@@ -9,11 +9,12 @@ import { SmsDriver, postWithTimeout } from './sms-driver';
  *
  * Shape, from the owner's PHP client:
  *   * POST JSON, 15s timeout, auth header `secret_key`
- *   * body: { phone, host, text, platform }
+ *   * body: { phone, host, text }
  *   * `host` identifies the sending server: a configured value, else the
  *     server's own IP (`gethostbyname(gethostname())`)
- *   * `platform: "kave"` routes through Kavenegar; null lets the gateway pick.
- *     The owner wants every message through Kavenegar.
+ *   * no `platform`: the gateway picks the line itself. Sending
+ *     `platform: "kave"` (Kavenegar) failed on the gateway with
+ *     "cURL library is not loaded".
  *
  * The secret is in source on the owner's decision (D26): the gateway has a
  * second verification factor held elsewhere. `SMS_RELAY_SECRET` overrides it.
@@ -24,8 +25,6 @@ import { SmsDriver, postWithTimeout } from './sms-driver';
 
 const DEFAULT_RELAY_URL = 'http://185.231.112.101/api/createsms';
 const DEFAULT_RELAY_SECRET = 'f21debfb-83ac-4624-a2f4-f08375043181';
-const DEFAULT_RELAY_PLATFORM = 'kave';
-
 /** `Http::timeout(15)` in the owner's client. */
 const REQUEST_TIMEOUT_MS = 15_000;
 
@@ -79,13 +78,10 @@ export function resetRelayHostCache() {
 }
 
 export function relayConfig() {
-  const platform = envOr('SMS_RELAY_PLATFORM', DEFAULT_RELAY_PLATFORM);
   return {
     url: envOr('SMS_RELAY_URL', DEFAULT_RELAY_URL),
     secret: envOr('SMS_RELAY_SECRET', DEFAULT_RELAY_SECRET),
     host: envOrNull('SMS_RELAY_HOST') ?? publicIpv4 ?? serverIpv4(),
-    // "default" sends null, so the gateway chooses the line itself.
-    platform: platform.toLowerCase() === 'default' ? null : platform,
   };
 }
 
@@ -137,7 +133,7 @@ export const relayDriver: SmsDriver = {
     const reply = await postWithTimeout(
       c.url,
       { 'Content-Type': 'application/json', secret_key: c.secret },
-      JSON.stringify({ phone: mobile, host: c.host, text, platform: c.platform }),
+      JSON.stringify({ phone: mobile, host: c.host, text }),
       REQUEST_TIMEOUT_MS,
     );