Fix multiple bugs in C code: memory leaks, NULL derefs, buffer overflow, OOB reads

[micheloosterhof]

• connection.c: Fix SSL_CTX memory leak for connect-type TLS/DTLS connections
  (only listen-type was freed, leaking ctx for outbound connections)
• connection.c: Add NULL check for SSL_CTX_new return value to prevent crash
• connection.c: Add bounds checks to connection_{transport,type,state}_to_string
  to prevent out-of-bounds array access on invalid enum values
• incident.c: Fix buffer overflow in opaque_data_dump - indent was unclamped and
  g_snprintf size parameter didn't account for indent offset
• log.c: Initialize level to "unknown" in logger_stdout_log and logger_file_log
  to prevent NULL pointer dereference in fprintf when no log level matches
• curl/module.c: Add NULL check after tempfile_new() to prevent NULL dereference
  and fix write() return type comparison (ssize_t vs size_t)
• python/module.c: Add NULL check after PyImport_Import for traceback module
• python/module.c: Fix memory leaks - add g_strfreev() for sys_paths,
  module_names in new() and module_names in hupy()
• python/module.c: Replace VLA with heap allocation in pygetifaddrs to prevent
  stack overflow with many network interfaces

https://claude.ai/code/session_014EiJbNgZBQnu8uSe7sWmYN