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>

README.md

@@ -10,6 +10,7 @@ A feature-rich IRC bot that brings Pokemon-style pet collecting and battling to
 - **Battle System**: Engage in turn-based battles with wild pets
 - **Team Management**: Activate/deactivate pets, swap team members
 - **Achievement System**: Unlock new areas by completing challenges
+- **Item Collection**: Discover and collect useful items during exploration
 
 ### Advanced Systems
 - **Dynamic Weather**: Real-time weather system affecting spawn rates
@@ -17,6 +18,7 @@ A feature-rich IRC bot that brings Pokemon-style pet collecting and battling to
 - **Location-Based Spawns**: Different pets spawn in different locations
 - **Level Progression**: Pets gain experience and level up
 - **Type Effectiveness**: Strategic battle system with type advantages
+- **Item System**: 16+ unique items with rarity tiers and special effects
 
 ### Technical Features
 - **Modular Architecture**: Clean, extensible codebase
@@ -78,6 +80,10 @@ A feature-rich IRC bot that brings Pokemon-style pet collecting and battling to
 - `!deactivate <pet>` - Move a pet to storage
 - `!swap <pet1> <pet2>` - Swap two pets' active status
 
+### Inventory Commands
+- `!inventory` / `!inv` / `!items` - View your collected items
+- `!use <item>` - Use a consumable item on your active pet
+
 ## 🌍 Locations
 
 ### Available Areas
@@ -112,10 +118,31 @@ Locations are unlocked by completing achievements:
 - Location-specific weather patterns
 - Real-time spawn rate modifications
 
+## 🎒 Item System
+
+### Item Categories
+- **🩹 Healing Items**: Restore pet HP (Small/Large/Super Potions, Energy Berries)
+- **⚔️ Battle Items**: Temporary combat boosts (Attack Boosters, Defense Crystals, Speed Elixirs)
+- **💎 Rare Items**: Special materials (Fire/Water Stones, Lucky Charms, Ancient Fossils)
+- **🏛️ Location Items**: Area-specific treasures (Shells, Mushrooms, Volcanic Glass, Ice Crystals)
+
+### Rarity Tiers
+- **○ Common**: Frequently found items (15% spawn rate)
+- **◇ Uncommon**: Moderately rare items (8-12% spawn rate)
+- **◆ Rare**: Valuable items (3-6% spawn rate)
+- **★ Epic**: Very rare items (2-3% spawn rate)
+- **✦ Legendary**: Ultra-rare items (1% spawn rate)
+
+### Item Discovery
+- 30% chance to find items during `!explore`
+- Location-specific items only spawn in certain areas
+- Items stack in inventory with quantity tracking
+- Use consumable items with `!use <item name>`
+
 ## 🌐 Web Interface
 
 Access the web dashboard at `http://localhost:8080/`:
-- **Player Profiles**: Complete stats and pet collections
+- **Player Profiles**: Complete stats, pet collections, and inventories
 - **Leaderboard**: Top players by level and achievements
 - **Locations Guide**: All areas with spawn information
 - **Help System**: Complete command reference
@@ -139,13 +166,19 @@ Access the web dashboard at `http://localhost:8080/`:
 
 ## 🐛 Recent Updates
 
-### Weather System Enhancement
+### v0.2.0 - Item Collection System
+- ✅ Complete item system with 16 unique items across 5 categories
+- ✅ Item discovery during exploration (30% chance)
+- ✅ Rarity tiers with symbols and colors (Common → Legendary)
+- ✅ Location-specific unique items and treasures
+- ✅ Inventory management with `!inventory` and `!use` commands
+- ✅ Web interface integration showing player inventories
+- ✅ Consumable items (healing potions, battle boosters, lucky charms)
+
+### v0.1.0 - Core Game & Weather System
 - ✅ Added background task for automatic weather updates
 - ✅ Changed weather durations from 2-6 hours to 30min-3hours
 - ✅ Implemented continuous weather coverage
-- ✅ Added graceful shutdown handling
-
-### Bug Fixes
 - ✅ Fixed database persistence on bot restart
 - ✅ Resolved individual player pages showing 'not found'
 - ✅ Corrected achievement count displays