Add ccg-router to Developer Productivity Tools

[linny006]

Adds ccg-router under Developer Productivity Tools.

It's a local Go daemon that serves Claude Code (Anthropic-compatible /v1/messages) and Codex CLI (OpenAI-compatible /v1/chat/completions) through one port. Each request is logged to a local SQLite ledger so developers can answer "how much did this side project actually cost me?" without a hosted dashboard. Three routing strategies (prefer-cheaper / prefer-capable / round-robin).

Fits this section alongside neighbors like Burnd, CodeCosts, and Agent Cost Guardrails — all of which target AI-coding cost/usage visibility.

Checklist:

• AI-powered / AI-enhanced: yes (routes API traffic for Claude Code + Codex CLI).
• Useful to developers: yes.
• Publicly accessible: yes, https://github.com/XZXY-AI/ccg-router.
• Free tier: yes (Apache-2.0, single static binary, free forever).
• Documented: README + docs/ site at https://xzxy-ai.github.io/ccg-router/.
• Format follows the CONTRIBUTING template: - **[Name](link)** – Description.
• Appended to the end of the section as required.

[linny006]

Quick update on this PR: just shipped v0.2.0 (https://github.com/XZXY-AI/ccg-router/releases/tag/v0.2.0) with streaming passthrough — the dual-CLI workflow now works end-to-end including the streaming completions both Claude Code and Codex CLI default to.