feat: Add conversation_id filtering to message endpoints (#8324)

* feat: Add conversation_id filtering to message list and search endpoints

Add optional conversation_id parameter to filter messages by conversation:
- client.agents.messages.list
- client.messages.list
- client.messages.search

Changes:
- Added conversation_id field to MessageSearchRequest and SearchAllMessagesRequest schemas
- Added conversation_id filtering to list_messages in message_manager.py
- Updated get_agent_recall_async and get_all_messages_recall_async in server.py
- Added conversation_id query parameter to router endpoints
- Updated Turbopuffer client to support conversation_id filtering in searches

Fixes #8320

🤖 Generated with [Letta Code](https://letta.com)

Co-Authored-By: Charles Packer <cpacker@users.noreply.github.com>

* add conversation_id to message and tpuf

* default messages filter for backward compatibility

* add test and auto gen

* fix integration test

* fix test

* update test

---------

Co-authored-by: letta-code <248085862+letta-code@users.noreply.github.com>
Co-authored-by: Charles Packer <cpacker@users.noreply.github.com>
Co-authored-by: christinatong01 <christina@letta.com>

letta/server/server.py

@@ -817,6 +817,7 @@ class SyncServer(object):
         assistant_message_tool_name: str = constants.DEFAULT_MESSAGE_TOOL,
         assistant_message_tool_kwarg: str = constants.DEFAULT_MESSAGE_TOOL_KWARG,
         include_err: Optional[bool] = None,
+        conversation_id: Optional[str] = None,
     ) -> Union[List[Message], List[LettaMessage]]:
         records = await self.message_manager.list_messages(
             agent_id=agent_id,
@@ -827,6 +828,7 @@ class SyncServer(object):
             ascending=not reverse,
             group_id=group_id,
             include_err=include_err,
+            conversation_id=conversation_id,
         )
 
         if not return_message_object:
@@ -862,6 +864,7 @@ class SyncServer(object):
         assistant_message_tool_name: str = constants.DEFAULT_MESSAGE_TOOL,
         assistant_message_tool_kwarg: str = constants.DEFAULT_MESSAGE_TOOL_KWARG,
         include_err: Optional[bool] = None,
+        conversation_id: Optional[str] = None,
     ) -> Union[List[Message], List[LettaMessage]]:
         records = await self.message_manager.list_messages(
             agent_id=None,
@@ -872,6 +875,7 @@ class SyncServer(object):
             ascending=not reverse,
             group_id=group_id,
             include_err=include_err,
+            conversation_id=conversation_id,
         )
 
         if not return_message_object: