fix(client): correctly scope client in multiproject setups

[hassiebp]

Important

Fixes get_client() to correctly include secret_key and host for clients in multi-project setups, preventing misconfiguration.

• Behavior:
  • In get_client(), ensure returned Langfuse client includes secret_key and host from existing instance.
  • Addresses potential misconfiguration in multi-project setups by correctly scoping client details.
• Logging:
  • Logs a warning if no public_key is provided in a multi-project setup, indicating tracing is disabled to prevent data leakage.

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Greptile Summary

Disclaimer: Experimental PR review

Fixes critical client initialization issues in multi-project setups by ensuring proper propagation of host and secret_key parameters when creating new Langfuse client instances via get_client().

• Ensures proper scoping of connection parameters (host, secret_key) in langfuse/_client/get_client.py for consistent client configuration
• Prevents potential data routing issues by inheriting connection parameters from original instance instead of using defaults
• Critical for scenarios where multiple projects are being monitored simultaneously

[greptile-apps]

LGTM

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