fix(mcp): normalize tools for Moonshot API

[lihailong00]

Summary

• generate stable Moonshot-compatible aliases for MCP tool names while retaining original names for upstream call routing
• add a missing root object type when an MCP schema defines object properties
• distribute the exact object anyOf/required schema shape reported in the issue into equivalent Moonshot-compatible branches
• leave unsupported complex combinator schemas unchanged

Validation

• uv run pytest packages/kosong/tests/test_kimi_tool_conversion.py tests/core/test_mcp_tool_names.py -q (9 passed)
• targeted Ruff check and format check passed
• targeted Pyright check passed with 0 errors
• remote compare verified: 1 commit, 4 intended files, 154 additions / 2 deletions

Closes #2531

---

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 1 additional finding.