fix(logging): Preserve host application logging configuration

[vdusek]

Problem

BasicCrawler.__init__ (with the default configure_logging=True) called configure_logger(root_logger, remove_old_handlers=True), wiping the host application's root logging handlers. Embedding Crawlee in a larger app silently removed the host's own logging configuration.

Changes

• The root logger is now configured only when it has no handlers yet, mirroring logging.basicConfig semantics. A host that has already configured logging keeps its configuration.
• The httpx logger silencing was moved out of BasicCrawler into HttpxHttpClient. It used to live unconditionally in the base crawler, even though the default HTTP client (ImpitHttpClient) doesn't use the httpx logger at all, and it reached into a third-party logger straight from the base class. The silencing now applies only when HttpxHttpClient is actually instantiated, which is where the noisy per-request httpx INFO logs originate.

Verification

Regression tests that fail without the fix:

• host-installed root handlers survive crawler construction,
• Crawlee still configures an unconfigured root logger,
• HttpxHttpClient silences the httpx logger to WARNING by default.

Behavior change

This intentionally changes observable behavior, since the old behavior was the bug: host apps keep their logging config.

For HttpxHttpClient users, the httpx logger is now silenced whenever the client is instantiated. Previously the silencing happened only during BasicCrawler construction, with configure_logging=True and an unconfigured root logger. As a result it now also applies with configure_logging=False and to standalone send_request usage.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.35%. Comparing base (7780e78) to head (3567e12).
⚠️ Report is 46 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2010      +/-   ##
==========================================
- Coverage   93.35%   93.35%   -0.01%     
==========================================
  Files         179      179              
  Lines       12482    12497      +15     
==========================================
+ Hits        11652    11666      +14     
- Misses        830      831       +1     

Flag	Coverage Δ
unit	93.35% <100.00%> (-0.01%)	⬇️

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[Mantisus]

LGTM