feat(litellm): add team name and user name support to LiteLLM credential

[raghava3107]

Summary

Adds a Custom Headers field to the LiteLLM credential, enabling users to pass any LiteLLM proxy headers in API requests. Also adds a comprehensive test suite for the ChatLiteLLM node.

Why is this needed?

LiteLLM is an AI gateway/proxy that routes requests to 100+ LLM providers (OpenAI, Anthropic, Bedrock, etc.) through a unified API. Organizations use LiteLLM for:

• Cost tracking — track spend per team, customer, or environment
• Tag-based routing — route requests to specific model deployments based on tags
• Rate limiting — enforce per-team or per-customer rate limits
• Audit logging — track who made each request

LiteLLM supports several request headers for these features (docs):

Header	Purpose
x-litellm-tags	Tag-based routing and spend tracking (comma-separated)
x-litellm-customer-id	End-user/customer tracking
x-litellm-end-user-id	End-user identification
x-litellm-spend-logs-metadata	Custom metadata in spend logs (JSON string)

Currently, Flowise's LiteLLM integration only supports an API key — there's no way to pass these headers to the proxy.

Solution

Credential (LitellmApi.credential.ts):

• Added optional Custom Headers field (JSON string)
• Example: {"x-litellm-tags": "team:activation,env:prod"}

Chat model (ChatLitellm.ts):

• Parses the custom headers JSON from credential
• Passes them as defaultHeaders in the OpenAI-compatible client configuration
• Malformed JSON is silently ignored (no crash)

Tests (ChatLitellm.test.ts) — 6 tests:

• ✅ Basic initialization with API key and model
• ✅ Custom headers passed correctly to the client
• ✅ Malformed JSON headers handled gracefully
• ✅ Backward compatibility without headers
• ✅ Works without basePath or custom headers
• ✅ Optional parameters (maxTokens, topP, timeout)

Backward Compatibility

The Custom Headers field is optional. Existing LiteLLM configurations continue to work without any changes.

Files Changed

File	Change
packages/components/credentials/LitellmApi.credential.ts	Added litellmCustomHeaders field
packages/components/nodes/chatmodels/ChatLitellm/ChatLitellm.ts	Parse and pass custom headers
packages/components/nodes/chatmodels/ChatLitellm/ChatLitellm.test.ts	New — 6 unit tests

Test Results

PASS nodes/chatmodels/ChatLitellm/ChatLitellm.test.ts
  ChatLitellm
    ✓ initializes with basic config (API key and model only)
    ✓ passes custom headers from credential when provided
    ✓ ignores malformed custom headers JSON gracefully
    ✓ works without custom headers (backward compatible)
    ✓ works without basePath or custom headers
    ✓ passes optional parameters when provided

Test Suites: 1 passed, 1 total
Tests:       6 passed, 6 total

[gemini-code-assist]

Code Review

This pull request introduces optional 'Team Name' and 'User Name' fields to the LiteLLM API credentials. These fields are then extracted and passed as custom headers ('x-litellm-team' and 'x-litellm-user') in the configuration of the ChatLiteLLM model. No review comments were provided, and there is no feedback to address.

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