docs(connector): add self-hosted connector integration guide

[BlackHole1]

Summary

Adds a dedicated integration guide, in both English and Simplified Chinese, for
pointing the oo CLI at a self-hosted connector server. The content is distilled
from the self-hosted connector feature (#291) and its follow-up cleanup (#292).

The command reference in docs/commands.md only records the per-command CLI
contract, so there was no single place explaining the end-to-end onboarding flow
or the HTTP contract a connector server must expose. The new guides cover both
audiences:

• Operators — oo connector login/logout, runtime tokens and the
  /access page, the OO_CONNECTOR_URL > OO_API_KEY > connector.toml >
  account routing precedence, headless/CI env overrides, and the OOMOL vs
  self-hosted feature differences (org identity rejected, async --wait
  unsupported, proxy dependent on server support).
• Server implementers — the /v1/* endpoints (method, path, purpose), the
  health envelope, the Bearer auth model, and the response shapes.

Changes

• docs/self-hosted-connector.md — English integration guide.
• docs/self-hosted-connector.zh-CN.md — Simplified Chinese integration guide.
• README.md / README-ZH_CN.md — link both guides from the Links section.

Notes

• Docs-only change; no source or test files touched.
• All documented behavior (endpoints/methods, routing precedence, login
  validation exit codes, oo auth status output shape, connector.toml format
  and paths) was cross-checked against the current implementation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 8036f1b0-9b07-4c9f-9fbe-001f2bceeb50

📥 Commits

Reviewing files that changed from the base of the PR and between 8b1207c and 0088eb3.

📒 Files selected for processing (4)

• README-ZH_CN.md
• README.md
• docs/self-hosted-connector.md
• docs/self-hosted-connector.zh-CN.md

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Summary by CodeRabbit

• Documentation
  • Added a new guide for setting up and using a self-hosted connector.
  • Updated the main README links to include the new connector integration guide.
  • Added a Chinese version of the self-hosted connector documentation.

Walkthrough

This PR adds two new documentation pages, docs/self-hosted-connector.md and its Chinese counterpart docs/self-hosted-connector.zh-CN.md, describing how to configure and use a self-hosted connector with the oo CLI, including login validation, environment overrides, feature differences from the OOMOL-hosted connector, status inspection, connector.toml storage/logout behavior, the required server HTTP contract, and a troubleshooting table. README.md and README-ZH_CN.md are each updated with a new link to their respective new page.

Sequence Diagram(s)

Not applicable — this change consists solely of documentation additions and README link updates with no code or control-flow changes.

Estimated code review effort: Low-Medium

Related PRs: None identified.

Suggested labels: documentation

Suggested reviewers: None identified.

🐰 A rabbit hops through docs anew,
Self-hosted paths in black and blue,
Two tongues speak of tokens bright,
README links now guide the sight,
No code was touched, just words made right.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title follows the required type(scope): subject format and accurately reflects the documentation update.
Description check	✅ Passed	The description is directly related to the docs-only self-hosted connector guide and README link updates.
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

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch docs/self-hosted-connector-guide

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