fix: reuse existing service by name instead of creating duplicates

[Raymondhou0917]

Summary

• Before creating a new service, check if one with the same --name already exists in the project
• If found, reuse its service ID and log: Found existing service 'my-app', redeploying...
• Only create a new service if no match is found

Problem

When running zeabur deploy --project-id <id> --name "my-app" and a service named my-app already exists, the CLI creates a duplicate service named my-app-over instead of updating the existing one.

Changes

• internal/cmd/deploy/deploy.go — added name-based lookup using ListAllServices before CreateEmptyService

Before/After

# Before: creates "my-app-over" as a new service
zeabur deploy --project-id <id> --name "my-app" -i=false

# After: finds and reuses existing "my-app" service
zeabur deploy --project-id <id> --name "my-app" -i=false
# Output: Found existing service 'my-app', redeploying...

Fixes #203

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6e553794-8b57-44c9-865c-396c47427342

📥 Commits

Reviewing files that changed from the base of the PR and between 76b8768 and 68e901c.

📒 Files selected for processing (1)

• internal/cmd/deploy/deploy.go

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• Create PR with unit tests

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