Complete TV webhook processing modes documentation update

📚 Comprehensive Documentation Update:
• Added TV webhook processing modes section to README.md
• Updated CHANGELOG.md with configurable processing feature details
• Enhanced SETUP.md with TV_WEBHOOK_PROCESSING_MODE configuration
• Added Step 7 testing procedures to TESTING.md for both modes

🔧 Configuration Documentation:
• Targeted Mode (default): Only process episodes mentioned in webhook
• Series Mode: Process entire series directory (legacy behavior)
• Smart fallback logic when episode data unavailable
• Clear examples and use case recommendations

📋 Testing Instructions:
• Step-by-step mode switching procedures
• Expected log output examples for each mode
• Environment variable configuration examples
• Docker restart procedures for testing

✨ User Benefits Documented:
• Efficiency comparison: targeted vs series processing
• File operation reduction for targeted mode
• Media server notification minimization
• Backward compatibility with existing setups

README.md

@@ -521,6 +521,42 @@ NFOGuard now creates **full-featured NFO files** with rich metadata from Sonarr:
 - ✅ **Runtime** and **ratings** data
 - ✅ **Timestamps** showing when NFOGuard processed the file
 - ✅ **Smart URL-safe endpoints** for processing individual seasons/episodes
+- ✅ **Configurable processing modes** for webhook efficiency
+
+## ⚙️ TV Webhook Processing Modes (v0.6.0+)
+
+NFOGuard offers two processing modes for TV show webhooks:
+
+### **Targeted Mode** (Default - `targeted`)
+**Best for**: Efficient processing, minimal file operations
+```bash
+TV_WEBHOOK_PROCESSING_MODE=targeted
+```
+**Behavior**: Only processes episodes mentioned in the webhook
+- ✅ **1 episode downloaded** → **1 episode processed**  
+- ✅ **Minimal file operations** - only touches new episode
+- ✅ **Reduced notifications** to media servers
+- ✅ **Faster processing** for single episode downloads
+
+**Example**: Download S41E07 → Only S41E07.nfo gets updated
+
+### **Series Mode** (`series`)
+**Best for**: Comprehensive updates, database synchronization
+```bash
+TV_WEBHOOK_PROCESSING_MODE=series  
+```
+**Behavior**: Processes entire TV series directory
+- 📺 **1 episode downloaded** → **All series episodes processed**
+- 🔄 **Complete sync** - ensures all episodes stay current  
+- 📋 **Database consistency** - all episode dates updated
+- 🛠️ **Legacy behavior** - matches previous versions
+
+**Example**: Download S41E07 → All 7 episodes in season get updated
+
+### **Smart Fallback**
+- If webhook contains no episode data → automatically uses series mode
+- If targeted mode fails → falls back to series processing  
+- Configuration validated at startup with helpful error messages
 
 🔍 Logging & Debugging
 # Enable verbose logging