feat: add LiteLLM provider support for model name remapping

[AnishDe12020]

closes #507

LiteLLM proxy expects plain model IDs without the provider prefix. This change strips the 'litellm/' prefix from model names before sending API requests, following the same pattern as zai-coding-plan.

Example:

• Spacebot config: channel = "litellm/kimi-k2p5"
• API request: {"model": "kimi-k2p5"}

Tested with dev instance:

• 60+ successful API calls
• All 6 agents generating profiles correctly
• Fallback chains working as expected

Fixes: model routing with LiteLLM proxy gateway

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 9ec9168a-fb02-4457-af77-ce083e42016f

📥 Commits

Reviewing files that changed from the base of the PR and between b7d5dd2 and 695e9ca.

📒 Files selected for processing (1)

• src/llm/model.rs

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Walkthrough

The remap_model_name_for_api function in src/llm/model.rs is enhanced to handle LiteLLM provider model ID remapping. When the provider is "litellm", the function strips the "litellm/" prefix from the model name if present and returns the plain model ID. Existing remapping behavior for other models remains unchanged.

Changes

Cohort / File(s)	Summary
LiteLLM Provider Model Remapping src/llm/model.rs	Added conditional logic to strip "litellm/" prefix from model names when provider is "litellm", while preserving existing remapping behavior for other cases.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related issues

• Issue #507: Directly addresses the same LiteLLM-specific model ID remapping implementation (stripping "litellm/" prefix) now present in this PR.

Possibly related PRs

• PR #223: Previously introduced the remap_model_name_for_api helper function to handle "zai/" prefix remapping; this PR extends the same function with additional provider-specific logic for "litellm/".
• PR #210: Also modifies model-name remapping logic in src/llm/model.rs, adding provider-specific remapping rules in a similar manner.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title clearly and concisely describes the main change: adding LiteLLM provider support for model name remapping.
Description check	✅ Passed	The pull request description is directly related to the changeset, providing context about the LiteLLM prefix stripping functionality, example usage, and test results.

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