fix(deploy): reuse existing service by name to prevent duplicates

[stantheman0128]

Summary

• When deploying with --project-id and --name but without --service-id, the CLI now checks if a service with the same name already exists before creating a new one
• If found, it reuses the existing service (same as providing --service-id)
• The --create flag can still be used to explicitly force creating a new service

Root Cause

In runDeploy, when --project-id is provided without --service-id, the code calls CreateEmptyService() unconditionally without checking for name collisions. This creates duplicate services (e.g. my-app-over).

Changes

• internal/cmd/deploy/deploy.go: Before creating a new service, call ListAllServices to check if one with the same name already exists. If it does, reuse it. If --create is explicitly set, always create a new service.

Fixes #203

Test plan

• Deploy with --project-id --name "my-app" twice — second deploy should update existing service, not create duplicate
• Deploy with --project-id --name "my-app" --create — should always create a new service
• Deploy with --project-id --service-id — behavior unchanged (uses provided service ID)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 0ccc45ad-8df2-4ff7-b623-b37dac681004

📥 Commits

Reviewing files that changed from the base of the PR and between 4750f37 and bc02f61.

📒 Files selected for processing (1)

• internal/cmd/deploy/deploy.go

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🧪 Generate unit tests (beta)

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