Remove pynacl and fix acked bool => int

app/CLAUDE.md

@@ -9,7 +9,6 @@ This document provides context for AI assistants and developers working on the F
 - **meshcore** - MeshCore radio library (local dependency at `../meshcore_py`)
 - **Pydantic** - Data validation and settings management
 - **PyCryptodome** - AES-128 encryption for packet decryption
-- **PyNaCl** - Ed25519/X25519 key exchange for direct message decryption
 - **UV** - Python package manager
 
 ## Directory Structure

app/routers/messages.py

@@ -115,7 +115,7 @@ async def send_direct_message(request: SendDirectMessageRequest) -> Message:
         sender_timestamp=now,
         received_at=now,
         outgoing=True,
-        acked=False,
+        acked=0,
     )
 
 
@@ -202,5 +202,5 @@ async def send_channel_message(request: SendChannelMessageRequest) -> Message:
         sender_timestamp=now,
         received_at=now,
         outgoing=True,
-        acked=False,
+        acked=0,
     )