feat(db): mesh data model — meshes, members, invites, audit log

- pgSchema "mesh" with 4 tables isolating the peer mesh domain
- Enums: visibility, transport, tier, role
- audit_log is metadata-only (E2E encryption enforced at broker/client)
- Cascade on mesh delete, soft-delete via archivedAt/revokedAt

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/public/pdfjs-images/editor-toolbar-edit.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="17" viewBox="0 0 16 17" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M14.9815 14.3461L14.3875 11.1451C14.3125 10.7361 14.1155 10.3621 13.8195 10.0641L5.0185 1.26214C4.2445 0.489141 2.9855 0.487141 2.2085 1.26214L0.5805 2.89014C-0.1935 3.66514 -0.1935 4.92514 0.5805 5.70014L9.3845 14.5031C9.6805 14.7981 10.0545 14.9941 10.4625 15.0691L13.6645 15.6631C13.7345 15.6751 13.8025 15.6821 13.8705 15.6821C14.1675 15.6821 14.4555 15.5651 14.6695 15.3511C14.9325 15.0871 15.0495 14.7121 14.9815 14.3461ZM2.5285 5.87814L1.3685 4.71814L1.3695 3.87014L3.1895 2.04914L4.0375 2.05014L5.1975 3.21014L2.5285 5.87814ZM10.6895 13.8401C10.5295 13.8101 10.3825 13.7331 10.2665 13.6161L3.4135 6.76314L6.0815 4.09514L12.9345 10.9471C13.0515 11.0651 13.1285 11.2121 13.1595 11.3731L13.6335 13.9301L13.2485 14.3151L10.6895 13.8401Z" fill="black"/>
+</svg>