refactor: rename package from RNS.Interfaces to ble_reticulum

Fixes namespace collision with Reticulum's own RNS.Interfaces package.
When both packages were installed, the collision caused import issues
and prevented BLE discovery between devices.

Changes:
- Rename src/RNS/Interfaces/ to src/ble_reticulum/
- Update pyproject.toml package configuration
- Update all imports in source and test files

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

examples/ble_minimal_test.py

@@ -21,7 +21,7 @@ import asyncio
 # Add parent directory to path
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), '../src'))
 
-from RNS.Interfaces.BLEFragmentation import BLEFragmenter, BLEReassembler
+from ble_reticulum.BLEFragmentation import BLEFragmenter, BLEReassembler
 
 
 def test_fragmentation():