docs: integrate cc-copilot-bridge for multi-provider setup

Cross-reference cc-copilot-bridge as complementary tool for:
- Cost optimization (99%+ savings via Copilot Pro+ flat rate)
- Rate limit bypass (unlimited access)
- Offline development (Ollama integration)

Added in:
• README.md - Dedicated section after "Not a Developer?"
• Section 9.13 - Alternative flat-rate subsection
• Section 10.4 - Rate limit solution in troubleshooting table
• Section 11.1 - "Where Other Tools Add Value" table
• Section 11.2 - Full setup guide with cost comparison

Links to: https://github.com/FlorianBruniaux/cc-copilot-bridge

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

README.md

@@ -82,6 +82,24 @@ Same agentic capabilities as Claude Code, but through a visual interface with no
 
 ---
 
+## 🔧 Hitting Rate Limits or High Costs?
+
+**cc-copilot-bridge** routes Claude Code through GitHub Copilot Pro+ for flat-rate access ($10/month instead of per-token billing).
+
+```bash
+# Install
+git clone https://github.com/FlorianBruniaux/cc-copilot-bridge.git && cd cc-copilot-bridge && ./install.sh
+
+# Use
+ccc   # Copilot mode (flat $10/month)
+ccd   # Direct Anthropic mode (per-token)
+cco   # Offline mode (Ollama, 100% local)
+```
+
+→ **[cc-copilot-bridge](https://github.com/FlorianBruniaux/cc-copilot-bridge)** — Multi-provider switching, rate limit bypass, 99%+ cost savings
+
+---
+
 ## 🎯 Learning Paths
 
 <details>