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/protocol.h

@@ -8,22 +8,30 @@
 typedef struct ssl_st SSL;
 
 typedef int Status;
-enum NET_STATUS { STATUS_OK, STATUS_ERROR, STATUS_FINISHED, STATUS_NEXT, STATUS_CHUNK, STATUS_MANIFEST, STATUS_CHECK };
+enum NET_STATUS {
+  STATUS_OK,
+  STATUS_ERROR,
+  STATUS_FINISHED,
+  STATUS_NEXT,
+  STATUS_CHUNK,
+  STATUS_MANIFEST,
+  STATUS_CHECK
+};
 
 void io_set_fds(int read_fd, int write_fd);
 void io_set_bwlimit(unsigned long long bytes_per_sec);
 typedef struct ssl_st SSL;
-void io_set_ssl(SSL *ssl);
-bool send_n_data(int file_descriptor, void *data, size_t data_size);
-bool receive_n_data(int file_descriptor, void *data, size_t data_size);
+void io_set_ssl(SSL* ssl);
+bool send_n_data(int file_descriptor, void* data, size_t data_size);
+bool receive_n_data(int file_descriptor, void* data, size_t data_size);
 
-bool send_str(int file_descriptor, char *data);
-char *receive_str(int file_descriptor);
-bool send_data(int file_descriptor, Data *data);
-Data *receive_data(int file_descriptor);
+bool send_str(int file_descriptor, char* data);
+char* receive_str(int file_descriptor);
+bool send_data(int file_descriptor, Data* data);
+Data* receive_data(int file_descriptor);
 bool send_int(int file_descriptor, int data);
-bool receive_int(int file_descriptor, int *data);
+bool receive_int(int file_descriptor, int* data);
 bool send_status(int file_descriptor, Status status);
-bool receive_status(int file_descriptor, Status *status);
+bool receive_status(int file_descriptor, Status* status);
 
 #endif