fix(python): handle missing JSON schema titles in json_schema_to_model

[liuxiaopai-ai]

Fixes #2435

Problem

The Python helper json_schema_to_model could pass a null/None model name into pydantic.create_model when the JSON schema omitted title (common for anonymous nested object schemas, e.g. array items). This raises:

TypeError: type.__new__() argument 1 must be str, not None

Fix

• Fall back to name and finally a generated model name when title is missing
• Add a regression test for an object schema containing an array of anonymous objects

Validation

• pytest -q python/tests/test_json_schema_to_model_missing_title.py
• ruff check python/composio/utils/shared.py python/tests/test_json_schema_to_model_missing_title.py

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[liuxiaopai-ai]

FYI: the failing 'Vercel' check appears to be an integration/auth issue on the repo side ('Authorization required to deploy'), not related to this Python-only change. If needed, a maintainer may need to authorize Vercel for this PR/run or mark it non-blocking.