docs: add TakoAPI directory badge

[oratis]

Hi! 👋 ClawRouter is listed in the TakoAPI open agent directory — a free, open catalog that helps people discover AI-agent projects ("one API to discover all agents").

Your listing: https://takoapi.com/agents/blockrunai-clawrouter

This PR adds a small badge near the top of the README that links back to that listing, so visitors can find the directory entry. It's entirely optional — if you'd prefer not to include it, just close this PR (no hard feelings, and apologies for the noise).

No tracking and no obligations. Thanks for building ClawRouter! 🙏

Summary by CodeRabbit

• Documentation
  • Added a service badge link to the "Phone & Voice Calls" HTTP API section of the documentation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 3268ac05-a742-4754-acce-3117b49dcc93

📥 Commits

Reviewing files that changed from the base of the PR and between a44d1ea and 7ac6786.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

Three lines are added to README.md inserting a "Listed on TakoAPI" badge link in the Phone & Voice Calls HTTP API section, adjacent to the existing curl example for placing a call. No code or public API declarations are modified.

Changes

TakoAPI Badge in README

Layer / File(s)	Summary
TakoAPI badge in Phone & Voice Calls section README.md	Adds a "Listed on TakoAPI" badge/link adjacent to the curl example in the Phone & Voice Calls HTTP API section.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a TakoAPI directory badge to the README file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Warning

⚠️ This pull request might be slop. It has been flagged by CodeRabbit slop detection and should be reviewed carefully.