Fix Windows build errors: config_parser.h, poll(), localtime()

- Replace sys/socket.h with platform_compat.h in config_parser.h
- Add #include <poll.h> for Windows in platform_compat.h
- Fix localtime() type mismatch: cast tv.tv_sec to time_t
- All 22 tests pass on Linux

lib/debug_config.c

@@ -217,7 +217,8 @@ void debug_output(debug_level_t level, debug_category_t category,
     /* Add timestamp with microseconds: hh:mm:ss-xxx.yyy */
     struct timeval tv;
     gettimeofday(&tv, NULL);
-    struct tm* tm_info = localtime(&tv.tv_sec);
+    time_t tv_sec = (time_t)tv.tv_sec;
+    struct tm* tm_info = localtime(&tv_sec);
     char time_str[32];
     strftime(time_str, sizeof(time_str), "%H:%M:%S", tm_info);
     offset += snprintf(buffer + offset, remaining, "[%s-%03ld.%03ld] ", time_str, tv.tv_usec / 1000, tv.tv_usec % 1000);

lib/platform_compat.h

@@ -103,6 +103,9 @@
     
     // nanosleep already defined in pthread_time.h on MSYS2
     
+    // poll is in ws2tcpip.h or poll.h on MSYS2
+    #include <poll.h>
+    
 #else
     // POSIX - include standard headers
     #include <sys/time.h>