feat(PP-3449): add Dev Panel guide to README

[sergak01]

📊 Dev Panel guide in README + next beta release trigger

Summary

Adds a dedicated Dev Panel section to the README (styled after the Request Inspector section) documenting the new UI capabilities shipped in the 1.0 line, and — being a feat-typed commit — arms semantic-release to cut the next beta once the stale-tag issue is resolved (see note below).

Key changes

• 📊 New ## Dev Panel README section: what the panel shows, the three ways to reposition it (drag & snap by the grip handle, corner picker in the settings popover, devPanel.position config), auto-hide behavior and the pin button, hiding/restoring via the settings popover and ?pp-dev-panel=show|hide URL params, localStorage persistence/precedence and the origin-scoped caveat, plus a config example.
• 📊 Cross-links between the devPanel option reference table and the new section.

⚠ Release note

The previous release run failed because the v1.0.0-beta.1 tag already exists — it was created on main on July 2 (commit 9edc66b) and that version is already published to npm under the beta dist-tag. Since the tag is not reachable from develop, semantic-release recomputed 1.0.0-beta.1 and collided with it. Before merging, the tag should be moved to f66e5f6 (chore(release): 1.0.0-beta.1 on develop) so the next run computes 1.0.0-beta.2.

Included commits:

• 54b8331 feat(PP-3449): add Dev Panel guide to README (position, auto-hide, hide/restore)

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Merge Request: origin/pp-3449-dev-panel-docs → origin/develop

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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• Commit unit tests in branch pp-3449-dev-panel-docs

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