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>

pnpm-workspace.yaml

@@ -0,0 +1,31 @@
+packages:
+  - apps/*
+  - packages/**
+  - tooling/*
+
+catalog:
+  '@tanstack/react-query': 5.90.6
+  '@tanstack/react-query-devtools': 5.90.2
+  '@tanstack/react-table': 8.21.3
+  '@vitest/coverage-v8': 4.0.14
+  '@ai-sdk/react': 2.0.94
+  ai: 5.0.94
+  envin: 1.1.10
+  eslint: 9.39.0
+  prettier: 3.6.2
+  react-hook-form: 7.66.0
+  react-native: 0.81.5
+  typescript: 5.9.3
+  vitest: 4.0.14
+  zod: 4.1.13
+
+catalogs:
+  node22:
+    '@types/node': 22.16.0
+  react19:
+    '@types/react': 19.1.14
+    '@types/react-dom': 19.1.9
+    react: 19.1.0
+    react-dom: 19.1.0
+
+onlyBuiltDependencies: duckdb