FastQueue has incorrect capacity handling for positive and zero maxSize values

[yingying9025123-code]

  `FastQueue.put_nowait()` has an off-by-one capacity check and incorrect
  handling of `maxSize=0`.

  Current code in `pysyncobj/fast_queue.py`:

  ```python
  if len(self.__queue) > self.__maxSize:
      raise Queue.Full()

Because the condition is checked before appending:

• FastQueue(1) accepts two items, and only rejects the third;
• FastQueue(0) accepts one item, then rejects the second.

Minimal reproducer:

  import queue
  from pysyncobj.fast_queue import FastQueue

  for max_size in (1, 0):
      q = FastQueue(max_size)
      q.put_nowait("first")
      try:
          q.put_nowait("second")
          print(f"FastQueue({max_size}): second item accepted")
      except queue.Full:
          print(f"FastQueue({max_size}): second item rejected")

Actual output:

  FastQueue(1): second item accepted
  FastQueue(0): second item rejected

Expected behavior:

• For FastQueue(1), the second item should raise queue.Full.
• SyncObjConf.validate() accepts commandsQueueSize=0, and SyncObj
  passes it directly to FastQueue. Following the standard Python
  queue.Queue(maxsize=0) convention, zero should mean an unbounded queue,
  so multiple items should be accepted.

Suggested fix:

  if self.__maxSize > 0 and len(self.__queue) >= self.__maxSize:
      raise Queue.Full()

This is confirmed on the current upstream master source.