Add client-side spell column sorting and improve inventory search

- Implement client-side sorting for all columns including spell_names
- Add computed_spell_names CTE for server-side sort fallback
- Add resizable columns with localStorage persistence
- Add Cloak slot detection by name pattern
- Increase items limit to 50000 for full inventory loading
- Increase proxy timeout to 60s for large queries
- Remove pagination (all items loaded at once for sorting)

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

inventory-service/database.py

@@ -232,7 +232,7 @@ class ItemRatings(Base):
 class ItemSpells(Base):
     """Spell information for items."""
     __tablename__ = 'item_spells'
-    
+
     item_id = Column(Integer, ForeignKey('items.id'), primary_key=True)
     spell_id = Column(Integer, primary_key=True)
     is_active = Column(Boolean, default=False)