Add Physical Security framework

[AllyPry]

Summary

This PR adds a new Physical Security framework focused on protecting crypto holders (individuals and organizations) against wrench attacks.

Placement as top-level category (not under Operational Security) after discussion with @scode2277 and @mattaereal in Discord.

Structure

10 pages covering:

• Checklist
• Defensive Design Principles
• Incident Response
• Overview
• Personal and Family OPSEC
• Recovery and Resilience
• Risk Factors
• Threat Model
• Transaction Flows
• Wallet Architecture

[github-actions]

Sidebar Configuration Reminder

This PR includes added, renamed, or removed documentation files:

• docs/pages/physical-security/checklist.mdx (added)
• docs/pages/physical-security/defensive-design-principles.mdx (added)
• docs/pages/physical-security/incident-response.mdx (added)
• docs/pages/physical-security/overview.mdx (added)
• docs/pages/physical-security/personal-and-family-opsec.mdx (added)
• docs/pages/physical-security/recovery-and-resilience.mdx (added)
• docs/pages/physical-security/risk-factors-and-early-signals.mdx (added)
• docs/pages/physical-security/threat-model.mdx (added)
• docs/pages/physical-security/transaction-flows-under-duress.mdx (added)
• docs/pages/physical-security/wallet-and-key-architecture.mdx (added)

Please ensure that:

• The sidebar in vocs.config.tsx has been updated to include these files
• New content has the dev: true parameter so it's marked as under development
• Sidebar links match the file paths - use the preview deployment to verify

See Contributing Guide – Sidebar & Navigation for more details.

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