docs: add page for postman at api collection

[jhelison]

Description

Add a page about the postman collection for Kiichain

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Documentation (updates documentation on the project)
• chore (Updates on dependencies, gitignore, etc)
• test (For updates on tests)

How Has This Been Tested?

No tests needed

[coderabbitai]

Walkthrough

Expanded the API reference README with introductory guidance for the KiiChain Pay Backend Postman collection. It documents collection and environment setup, QueryServer and MsgServer request grouping, automatic signing for write requests, required environment variables, setup steps, related authentication and guide links, regeneration notes, and a warning to keep priv_key private.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the documentation update for the Postman API collection.
Description check	✅ Passed	The description matches the change by describing a Postman collection page for Kiichain.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/postman

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[Copilot]

Pull request overview

Adds introductory documentation to the KiiChain Pay API Reference landing page so readers can use the official Postman collection alongside the generated endpoint reference.

Changes:

• Adds GitBook frontmatter and an expanded introduction to the API Reference section.
• Documents how to open and use the Postman collection (including environment variables and basic workflow).

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@kiichain-pay/api-reference/README.md`:
- Around line 46-48: Update the Postman warning in the surrounding hint to
clarify that environment values are not universally visible: instruct users to
store api_key and priv_key in local/current values or Postman Vault, and warn
that initial/shared values can sync with workspace collaborators. Remove the
implication that all environment values are exposed.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7014de43-73fe-43e2-b043-8c798819447a

📥 Commits

Reviewing files that changed from the base of the PR and between c6e2943 and 5753936.

📒 Files selected for processing (1)

• kiichain-pay/api-reference/README.md