fix: reformat codebase and fix const-correctness for CI lint

- Reformat all C/H files to match .clang-format (LLVM style)
- Fix 26 cppcheck const-correctness warnings (constParameterPointer,
  constVariablePointer, constVariable)
- Update function declarations in headers to match const parameters

src/shared/log.h

@@ -1,14 +1,9 @@
 #ifndef LOG_H
 #define LOG_H
 
-typedef enum {
-  LOG_LEVEL_DEBUG,
-  LOG_LEVEL_INFO,
-  LOG_LEVEL_WARNING,
-  LOG_LEVEL_ERROR
-} LogLevel;
+typedef enum { LOG_LEVEL_DEBUG, LOG_LEVEL_INFO, LOG_LEVEL_WARNING, LOG_LEVEL_ERROR } LogLevel;
 
-void log_message(LogLevel log_level, char *message, ...);
+void log_message(LogLevel log_level, char* message, ...);
 void set_log_level(LogLevel level);
 
 #endif