* codebase: Remove web frontend and related services
* refactor: Update StartPPROF to accept context and adjust related tests
* refactor: Simplify SetIfZero functions and update related tests
* config: Clarify DowngradeConfig method documentation regarding permanent removal of deprecated fields
* refactor: Rename setIfZeroAndWarn to setDefaultIfZeroWarn for clarity and update related calls
* refactor: Update error handling in DataHistoryManager and remove redundant error variable
