feat(gro-194): SMS provider service with Telnyx SDK integration

- Added telnyx npm package
- Created sms.ts with SmsProvider interface
- Implemented TelnyxProvider with sendSms() and validateWebhookSignature()
- Added createSmsProvider() factory function
- Added smsSend() convenience function that skips when SMS_ENABLED=false
- Provider abstraction allows future Twilio or other providers
- E.164 phone validation on send
- Webhook signature verification using HMAC-SHA256

Co-Authored-By: Paperclip <noreply@paperclip.ing>

pnpm-lock.yaml

@@ -40,6 +40,9 @@ importers:
       nodemailer:
         specifier: ^6.9.16
         version: 6.10.1
+      telnyx:
+        specifier: ^6.41.0
+        version: 6.41.0(ws@8.19.0)
       zod:
         specifier: ^4.3.6
         version: 4.3.6
@@ -2103,6 +2106,9 @@ packages:
     resolution: {integrity: sha512-O/IEdcCUKkubz60tFbGA7ceITTAJsty+lBjNoorP4Z6XRqaFb/OjQjZODophEcuq68nKm6/0r+6/lLQ+XVpk8g==}
     engines: {node: '>=18.0.0'}
 
+  '@stablelib/base64@1.0.1':
+    resolution: {integrity: sha512-1bnPQqSxSuc3Ii6MhBysoWCg58j97aUjuCSZrGSmDxNqtytIi0k8utUenAwTZN4V5mXXYGsVUI9zeBqy+jBOSQ==}
+
   '@standard-schema/spec@1.1.0':
     resolution: {integrity: sha512-l2aFy5jALhniG5HgqrD6jXLi/rUWrKvqN/qJx6yoJsgKhblVd+iqqU4RCXavm/jPityDo5TCvKMnpjKnOriy0w==}
 
@@ -3073,6 +3079,9 @@ packages:
   fast-levenshtein@2.0.6:
     resolution: {integrity: sha512-DCXu6Ifhqcks7TZKY3Hxp3y6qphY5SJZmrWMDrKcERSOXWQdMhU9Ig/PYrzyw/ul9jOIyh0N4M0tbC5hodg8dw==}
 
+  fast-sha256@1.3.0:
+    resolution: {integrity: sha512-n11RGP/lrWEFI/bWdygLxhI+pVeo1ZYIVwvvPkW7azl/rOy+F3HYRZ2K5zeE9mmkhQppyv9sQFx0JM9UabnpPQ==}
+
   fast-uri@3.1.0:
     resolution: {integrity: sha512-iPeeDKJSWf4IEOasVVrknXpaBV0IApz/gp7S2bb7Z4Lljbl2MGJRqInZiUrQwV16cpzw/D3S5j5Julj/gT52AA==}
 
@@ -4066,6 +4075,9 @@ packages:
   stackback@0.0.2:
     resolution: {integrity: sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw==}
 
+  standardwebhooks@1.0.0:
+    resolution: {integrity: sha512-BbHGOQK9olHPMvQNHWul6MYlrRTAOKn03rOe4A8O3CLWhNf4YHBqq2HJKKC+sfqpxiBY52pNeesD6jIiLDz8jg==}
+
   std-env@3.10.0:
     resolution: {integrity: sha512-5GS12FdOZNliM5mAOxFRg7Ir0pWz8MdpYm6AY6VPkGpbA7ZzmbzNcBJQ0GPvvyWgcY7QAhCgf9Uy89I03faLkg==}
 
@@ -4145,6 +4157,14 @@ packages:
     resolution: {integrity: sha512-g9ljZiwki/LfxmQADO3dEY1CbpmXT5Hm2fJ+QaGKwSXUylMybePR7/67YW7jOrrvjEgL1Fmz5kzyAjWVWLlucg==}
     engines: {node: '>=6'}
 
+  telnyx@6.41.0:
+    resolution: {integrity: sha512-93eKksI6HnLYp8e4DGlpC3SkBAfagblE+uug0FNDLT/+mix3PP0RveoQ/YZeRdxDhjMcoXVgeusJsgFP6PvUdw==}
+    peerDependencies:
+      ws: ^8.18.0
+    peerDependenciesMeta:
+      ws:
+        optional: true
+
   temp-dir@2.0.0:
     resolution: {integrity: sha512-aoBAniQmmwtcKp/7BzsH8Cxzv8OL736p7v1ihGb5e9DJ9kTwGWHrQrVB5+lfVDzfGrdRzXch+ig7LHaY1JTOrg==}
     engines: {node: '>=8'}
@@ -6667,6 +6687,8 @@ snapshots:
     dependencies:
       tslib: 2.8.1
 
+  '@stablelib/base64@1.0.1': {}
+
   '@standard-schema/spec@1.1.0': {}
 
   '@standard-schema/utils@0.3.0': {}
@@ -7703,6 +7725,8 @@ snapshots:
 
   fast-levenshtein@2.0.6: {}
 
+  fast-sha256@1.3.0: {}
+
   fast-uri@3.1.0: {}
 
   fast-xml-builder@1.1.4:
@@ -8690,6 +8714,11 @@ snapshots:
 
   stackback@0.0.2: {}
 
+  standardwebhooks@1.0.0:
+    dependencies:
+      '@stablelib/base64': 1.0.1
+      fast-sha256: 1.3.0
+
   std-env@3.10.0: {}
 
   stop-iteration-iterator@1.1.0:
@@ -8788,6 +8817,12 @@ snapshots:
 
   tapable@2.3.0: {}
 
+  telnyx@6.41.0(ws@8.19.0):
+    dependencies:
+      standardwebhooks: 1.0.0
+    optionalDependencies:
+      ws: 8.19.0
+
   temp-dir@2.0.0: {}
 
   tempy@0.6.0: