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>

tooling/typescript/base.json

@@ -0,0 +1,27 @@
+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  "compilerOptions": {
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "target": "ES2022",
+    "lib": ["ES2022"],
+    "allowJs": true,
+    "resolveJsonModule": true,
+    "moduleDetection": "force",
+    "isolatedModules": true,
+
+    "incremental": true,
+    "disableSourceOfProjectReferenceRedirect": true,
+    "tsBuildInfoFile": "${configDir}/.cache/tsbuildinfo.json",
+
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "checkJs": true,
+
+    "module": "Preserve",
+    "moduleResolution": "Bundler",
+    "noEmit": true,
+  },
+  "files": ["./reset.d.ts"],
+  "exclude": ["node_modules", "build", "dist", ".next", ".expo", ".wxt"]
+}