Move init_global_memori from deep_assistant.py to fastapi_app.py
lifespan function for proper application-level initialization.
This ensures Memori is initialized once at startup and closed at
shutdown, rather than checking and potentially initializing on every
agent creation.
Changes:
- fastapi_app.py: Add Memori init/close in lifespan
- deep_assistant.py: Simplify to only get memori_manager
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Co-Authored-By: Claude <noreply@anthropic.com>