chore: scaffold monorepo and migrate uhd_web design system (W0-A)

- pnpm workspace: apps/{web,server}, packages/{contracts,db,domain,adapters,tasks,agent,testkit}
- server: Hono + zod-openapi, API Key auth with scopes, redacting pino logger, SSE event bus with replay, worker heartbeat
- db: Kysely + pg, file migrator, 0001_init (settings/api_key/audit_event/outbox_event)
- web: React Router 7 SPA console shell with 12 workspace placeholders, uhd_web tokens/ui/guard scripts
- docs: ADR-001 (Node over Deno), dev runbook, design system rules

Co-Authored-By: Claude Fable 5.1 <[email protected]>

biome.json

@@ -0,0 +1,41 @@
+{
+  "$schema": "./node_modules/@biomejs/biome/configuration_schema.json",
+  "vcs": { "enabled": true, "clientKind": "git", "useIgnoreFile": true },
+  "files": {
+    "includes": [
+      "**",
+      "!**/node_modules",
+      "!**/dist",
+      "!**/build",
+      "!**/.react-router",
+      "!spikes",
+      "!docs",
+      "!apps/web/app/app.css",
+      "!apps/web/app/lib/design-tokens.generated.ts"
+    ]
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineWidth": 120
+  },
+  "javascript": {
+    "formatter": { "quoteStyle": "double", "semicolons": "always", "trailingCommas": "all" }
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "preset": "recommended",
+      "style": { "noNonNullAssertion": "off" },
+      "suspicious": { "noArrayIndexKey": "off" }
+    }
+  },
+  "assist": { "actions": { "source": { "organizeImports": "on" } } },
+  "overrides": [
+    {
+      "includes": ["apps/web/app/components/ui/**"],
+      "linter": { "rules": { "a11y": "off", "security": { "noDangerouslySetInnerHtml": "off" } } }
+    }
+  ]
+}