fix(WebSearchTool): add configurable timeout parameter

[fuleinist]

Problem

Both search_duckduckgo() and search_bing() in WebSearchTool call requests.get() without a timeout argument. This causes requests to hang indefinitely in slow/corporate proxy environments, and provides no way for users to adjust the wait time.

Solution

Adds an optional timeout parameter to WebSearchTool.__init__() with a default of 30 seconds. All requests.get calls inside the search methods now pass timeout=self.timeout.

This is a non-breaking change: the default behavior is unchanged.

Usage example

from smolagents import WebSearchTool

# Use default 30-second timeout
tool = WebSearchTool()

# Custom 60-second timeout for slow networks
tool = WebSearchTool(timeout=60)

Notes

• Related to issue Make HTTP request timeout configurable in WebSearchTool #2162 (open)

[VANDRANKI]

Good addition - having a configurable timeout is better than leaving it to the library default (which is often unlimited).

One gap: the timeout parameter is wired to search_duckduckgo and search_bing, but search_exa (added in #2139) hardcodes timeout=30 in its requests.post call and ignores self.timeout. Should pass timeout=self.timeout there too for consistency.