[messages] require phone numbers uniqness

[capcom6]

Greptile Summary

The PR enforces recipient phone-number uniqueness after normal validation and improves client-facing duplicate-ID and validation errors.

• Rejects repeated normalized phone numbers during message preparation.
• Returns concise validation and duplicate-ID responses through the third-party API.
• Adds handler and end-to-end coverage for uniqueness and duplicate message IDs.
• Updates generated OpenAPI wording and suppresses a planned FCM token deprecation warning.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains.

No blocking failure remains.

Important Files Changed

Filename	Overview
internal/sms-gateway/modules/messages/service.go	Normalizes recipients and rejects duplicate resulting phone-number strings before preparing the message.
internal/sms-gateway/handlers/messages/3rdparty.go	Maps wrapped validation and duplicate-ID errors to concise client-facing HTTP responses.
internal/sms-gateway/handlers/messages/3rdparty_test.go	Adds focused coverage for error status and response-message behavior.
test/e2e/messages_test.go	Adds end-to-end coverage for duplicate recipients, distinct recipients, and duplicate message IDs.
go.mod	Promotes testify to a direct test dependency and records its indirect dependencies.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Message request] --> B[Validate and normalize phone numbers]
    B --> C{Normalized number already seen?}
    C -- Yes --> D[Return validation error]
    C -- No --> E[Record number]
    E --> F{More recipients?}
    F -- Yes --> B
    F -- No --> G[Prepare and enqueue message]

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_{Reviews (5): Last reviewed commit: "[lint] ignore FCM Fid migration" | Re-trigger Greptile}

[github-actions]

🤖 Pull request artifacts

Platform	File
🐳 Docker	GitHub Container Registry
🍎 Darwin arm64	server_Darwin_arm64.tar.gz
🍎 Darwin x86_64	server_Darwin_x86_64.tar.gz
🐧 Linux arm64	server_Linux_arm64.tar.gz
🐧 Linux i386	server_Linux_i386.tar.gz
🐧 Linux x86_64	server_Linux_x86_64.tar.gz
🪟 Windows arm64	server_Windows_arm64.zip
🪟 Windows i386	server_Windows_i386.zip
🪟 Windows x86_64	server_Windows_x86_64.zip