fix: bump litellm lower bound to >=1.77.0

[nabinchha]

Summary

• Bumps the litellm lower bound from >=1.73.6 to >=1.77.0 in the engine package. ImageURLListItem (imported in litellm_overrides.py) was introduced in litellm 1.77.0 — the previous lower bound allowed resolving versions (1.73.6–1.76.x) that don't have this class, causing an ImportError at runtime.

This version bump should have been included in #385, which added the ImageURLListItem import.

Test plan

• Confirm from litellm.types.llms.openai import ImageURLListItem works with litellm 1.77.0
• Run existing test_litellm_overrides.py tests pass

[greptile-apps]

Greptile Summary

This PR tightens the litellm lower bound in packages/data-designer-engine/pyproject.toml from >=1.73.6 to >=1.77.0 and updates uv.lock to match, preventing installation of litellm versions (1.73.6–1.76.x) that lack ImageURLListItem — the class imported in litellm_overrides.py and patched at runtime via patch_image_url_list_item().

• The fix correctly closes an ImportError window introduced in PR fix: patch litellm ImageURLListItem to make index field optional (#384) #385 where from litellm.types.llms.openai import ImageURLListItem would fail on any litellm version below 1.77.0.
• The upper bound <1.80.12 is unchanged and the currently-resolved version in uv.lock (1.80.11) satisfies the new range.
• Both pyproject.toml and uv.lock are consistent with each other.
• No logic, tests, or other source files are modified; the change is purely a dependency constraint correction.

Confidence Score: 5/5

• This PR is safe to merge — it is a minimal, targeted dependency constraint fix with no code changes.
• The change is a single lower-bound bump that closes a well-understood ImportError window. The uv.lock is consistent, the resolved version (1.80.11) satisfies the new range, and no callers, contracts, or other packages are affected.
• No files require special attention.

Important Files Changed

Filename	Overview
packages/data-designer-engine/pyproject.toml	Bumps litellm lower bound from >=1.73.6 to >=1.77.0 to match the minimum version that provides ImageURLListItem; upper bound <1.80.12 unchanged and resolved lock version (1.80.11) satisfies the new range.
uv.lock	requires-dist entry for data-designer-engine updated to reflect the new litellm specifier >=1.77.0,<1.80.12; resolved package version remains 1.80.11, which is valid within the new bounds.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[install data-designer-engine] --> B{litellm version resolved}
    B -->|Before fix 1.73.6 to 1.76.x| C[ImportError - ImageURLListItem missing]
    B -->|After fix 1.77.0 to 1.80.11| D[Import succeeds - ImageURLListItem available]
    D --> E[patch_image_url_list_item runs at startup]
    E --> F[ImageURLListItem.index made optional for OpenRouter compat]

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_{Last reviewed commit: cac5397}