fix: JS template uses OrkesClients.from() with optional auth

[nthmost-orkes]

Summary

The JavaScript worker template was using orkesConductorClient which requires keyId/keySecret — those render as empty strings for OSS users, causing the client to fail authentication.

Changes

• Replace orkesConductorClient with OrkesClients.from() — auth fields are optional in OrkesApiConfig
• Use Mustache sections ({{#auth_key}}...{{/auth_key}}) so keyId/keySecret are only included when auth is configured
• For OSS users (no auth), generates:

  const config = { serverUrl: "http://localhost:8080/api" };

• For Orkes users (auth configured), generates:

  const config = {
    serverUrl: "https://...",
    keyId: "...",
    keySecret: "...",
  };

• Switch from TaskManager to TaskHandler (consistent with SDK docs and exports)

Works with the CLI fix in conductor-oss/conductor-cli#78 that defaults server_url to http://localhost:8080/api.

Related issues

Closes conductor-oss/getting-started#15

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