Add complete item collection system (v0.2.0)

🎒 Item Collection System:
- 16 unique items across 5 categories (healing, battle, rare, location, special)
- Rarity tiers: Common, Uncommon, Rare, Epic, Legendary with symbols
- 30% chance to find items during exploration
- Location-specific items (shells, mushrooms, crystals, runes)
- Inventory management with \!inventory and \!use commands
- Web interface integration showing player inventories
- Consumable items: healing potions, battle boosters, lucky charms

🔧 Technical Updates:
- Added items and player_inventory database tables
- New Inventory module for item management
- Updated game engine with item discovery system
- Enhanced web interface with inventory display
- Item initialization from config/items.json

🆕 New Commands:
- \!inventory / \!inv / \!items - View collected items by category
- \!use <item name> - Use consumable items on active pets

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

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

modules/exploration.py

@@ -35,6 +35,8 @@ class Exploration(BaseModule):
             self.send_message(channel, f"{nickname}: {encounter['message']}")
         elif encounter["type"] == "empty":
             self.send_message(channel, f"🔍 {nickname}: {encounter['message']}")
+        elif encounter["type"] == "item_found":
+            self.send_message(channel, f"{nickname}: {encounter['message']}")
         elif encounter["type"] == "encounter":
             # Store the encounter for potential catching
             self.bot.active_encounters[player["id"]] = encounter["pet"]