fix: resolve mypy type errors in axons.py

Fixed 3 mypy errors:
1. Removed duplicate import of axon_subscribe_sse_params on line 32
2. Added explicit type annotation for sequence_to_use: int | Omit (sync)
3. Added explicit type annotation for sequence_to_use: int | Omit (async)

This allows the variable to hold either an int or an Omit value,
which is then properly filtered by the transform() function.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: tode-rl

src/runloop_api_client/resources/axons/axons.py

@@ -29,7 +29,6 @@
 from ..._constants import RAW_RESPONSE_HEADER
 from ..._streaming import Stream, AsyncStream, ReconnectingStream, AsyncReconnectingStream
 from ...pagination import SyncAxonsCursorIDPage, AsyncAxonsCursorIDPage
-from ...types.axons import axon_subscribe_sse_params
 from ..._base_client import AsyncPaginator, make_request_options
 from ...types.axon_view import AxonView
 from ...types.axon_event_view import AxonEventView
@@ -311,6 +310,7 @@ def subscribe_sse(
 
         def create_stream(last_sequence: str | None) -> Stream[AxonEventView]:
             # Use user-provided after_sequence for initial stream, then use last_sequence for reconnections
+            sequence_to_use: int | Omit
             if last_sequence is not None:
                 sequence_to_use = int(last_sequence)
             elif not isinstance(after_sequence, Omit):
@@ -626,6 +626,7 @@ async def subscribe_sse(
 
         async def create_stream(last_sequence: str | None) -> AsyncStream[AxonEventView]:
             # Use user-provided after_sequence for initial stream, then use last_sequence for reconnections
+            sequence_to_use: int | Omit
             if last_sequence is not None:
                 sequence_to_use = int(last_sequence)
             elif not isinstance(after_sequence, Omit):