Update IHostapd interface to replace bool returns with exceptions and direct return values

[abeltrano]

Type

• Bug fix
• Feature addition
• Feature update
• Documentation
• Build Infrastructure

Side Effects

• Breaking change
• Non-functional change

Goals

• Enable IHostapd consumers to apply consistent calling and error checking.

Technical Details

• Change the following functions to throw exceptions instead of returning bool:
  • Enable, Disable, Terminate, Ping, Reload, SetProperty, SetSsid, SetWpaProtocols, SetKeyManagement.
• Change GetProperty return type from bool to std::string, which captures the property value.
  • Replace bool returns with HostapdException.

Test Results

• All unit tests pass.

Reviewer Focus

• None

Future Work

• None

Checklist

• Build target all compiles cleanly.
• clang-format and clang-tidy deltas produced no new output.
• Newly added functions include doxygen-style comment block.