docs: rewrite README as a concise fork guide

[glopyglerky]

Outcome

Replaces the long upstream-style root README with a concise guide that is honest about this repository being a personal fork. It keeps quick start, authentication, Codex configuration, data paths, Kubernetes, development, security, and license information.

Live badges report fork activity and the upstream release. The quick start explicitly uses the upstream image because this fork does not publish its own release or container image. The static model table and contributor wall are replaced with live API and GitHub links.

Validation

• source-backed route, auth, strategy, and data-path review
• local README link audit
• anti-slop language audit
• git diff --check

Boundary

Documentation only. No proxy behavior, release artifact, or deployment changed.

[glopyglerky]

@codex review

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 4c63d0ef-5e0c-4b79-93ec-009c27398713

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