fix(search): bound external provider requests

[RerankerGuo]

Description

The Google Custom Search and Bocha search clients issued external HTTP requests without a timeout. A stalled provider could therefore hold a retrieval worker indefinitely and delay or exhaust the search pipeline.

This change applies a 30-second request timeout to both provider clients. Existing error handling remains unchanged: request failures still return the providers current empty-result fallback.

Related Issue (Required): N/A — network-boundary regression reproduced on current main.

Type of change

• Bug fix (non-breaking)

How Has This Been Tested?

• Before: both new tests failed because the actual requests.get/post calls omitted timeout.
• After: .venv/bin/pytest tests/memories/textual/test_internet_search_timeouts.py -q (2 passed).
• Ruff check and format pass for all three changed files.

Impact

• Breaking change: no
• Affected modules: Google Custom Search and Bocha search clients
• Dependencies/API schema: unchanged

[Memtensor-AI]

🤖 Open Code Review

Target: PR #2217
Task: a8c020c93955b90b
Base: main
Head: fix/internet-search-request-timeouts

✅ OpenCodeReview: No comments generated. Looks good to me.

Generated by cloud-assistant via Open Code Review.

[Memtensor-AI]

✅ Automated Test Results: PASSED

All tests passed (2/2 executed). memos_python_core/changed-repo-python: 2/2. Duration: 5s

Branch: fix/internet-search-request-timeouts