Fix: Add null checks for config.Router to prevent undefined errors

[DioNanos]

🐛 Bug Description

CCR crashes with TypeError: Cannot read properties of undefined when accessing config.Router properties without checking if config.Router exists first.

🔍 Root Cause

Multiple locations in the codebase access config.Router.xxx without verifying that config.Router is defined. This happens when:

• No Router configuration is provided in config.json
• First-time setup without Router section
• Configuration files missing Router object

✅ Changes Made

Files Modified:

• src/agents/image.agent.ts (line 59)
• src/utils/router.ts (lines 161, 227)
• src/utils/modelSelector.ts (line 122)

Fix Pattern:

All fixes follow defensive programming:

// Before
if (!config.Router.image)

// After  
if (!config.Router || !config.Router.image)

🧪 Testing

Tested with:

• ✅ Qwen3 14B via CCR → Ollama
• ✅ GLM-4 9B via Ollama (direct)
• ✅ DeepSeek-R1 8B via Ollama (direct)
• ✅ CCR health endpoint

All tests passed without crashes.

📝 Additional Notes

This is a defensive programming fix that prevents crashes when config.Router is undefined. No functionality changes, only safety improvements.