Proxy Issue #4172
Detect if proxy is set - norma path
Proxy not set - test timeout on HF_ENDPOINT

Fix sporadic Windows segfault in loadModel with numeric plugin config
Root cause fix: openvinotoolkit/openvino#35714

OVMS passes plugin_config_t (std::map<std::string, ov::Any>) to
compile_model, but ov::Any values for numeric properties like
NUM_STREAMS
can carry either int64_t or std::string depending on the code path.
OpenVINO's CPU plugin unconditionally calls val.as<std::string>() on all
properties, triggering an unsafe iostream conversion when the value is
numeric — causing sporadic memory corruption and segfault on Windows.

Add a typed normalization table in prepareDefaultPluginConfig that
converts
known numeric/bool properties (NUM_STREAMS, INFERENCE_NUM_THREADS,
AUTO_BATCH_TIMEOUT, ENABLE_CPU_PINNING) from string to their native type
before compile_model is called. String-typed properties like
PERFORMANCE_HINT
are untouched. Normalization also recurses into nested DEVICE_PROPERTIES
maps.

- [ ] Unit tests added.
- [ ] The documentation updated.
- [ ] Change follows security best practices.
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