Cleanup, Tests, and Documentation

[google-labs-jules]

• Renamed src/hello.cpp/hpp to src/rest_api.cpp/hpp.
• Moved src/main.cpp to examples/basic_usage.cpp.
• Implemented comprehensive integration tests in tests/rest_api_test.cpp.
• Updated README.md with detailed installation and usage instructions.
• Added Doxygen-style documentation to src/rest_api.hpp.
• Added patches/disable_ssl.patch for cpp-httplib to resolve toolchain issues with SSL.
• Updated Bazel build files to reflect changes.

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PR created automatically by Jules for task 10814092622424306929 started by @Yuki-cpp

[google-labs-jules]

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