- Add salutation field to knowledge_user schema (after alias, nullable)
- Update users_store() to accept and store salutation
- Add salutation to users_store and users_update tool schemas
- Add salutation to users_filter output display
- Add Salutation to User Context in telegram and xmpp clients
- Refactor create_table() to use per-table schema functions
- Add _TABLE_SCHEMAS dict mapping table names to schema factories
- Add ensure_table() for lazy table creation on first access
- Tables auto-create if missing when any CRUD operation is called
