fix: OSS usability improvements (whoami, workflow create, code gen)

[nthmost-orkes]

Summary

• CI - GitHub Actions workflow #4 conductor workflow create: Add success message after registration (was silent on success)
• Auto update command #16 conductor whoami: Gracefully handle no-auth OSS configuration instead of erroring out; shows server URL and notes OSS mode
• Added webhook commands #15 conductor code: Default server_url to http://localhost:8080/api when no server is configured, so generated projects connect out of the box

Details

workflow create (#4)

registerWorkflow now prints Workflow '<name>' version <N> registered successfully on success.

whoami (#16)

When no auth is configured (normal for OSS Conductor), whoami now shows:

Server:         http://localhost:8080/api
Authentication: none (OSS Conductor)

Instead of an error.

code default server_url (#15)

When no CONDUCTOR_SERVER_URL env var or config file is set, generated code now gets http://localhost:8080/api as the server URL instead of an empty string. This pairs with CLI template fixes in conductor-oss/cli-templates.

Related issues

Closes conductor-oss/getting-started#4
Closes conductor-oss/getting-started#16
Partially addresses conductor-oss/getting-started#15

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