Implement ordering MVP domain layer per spec (issue #1)

Scaffolds the TanStack Start + Drizzle/Postgres + Better Auth app and
implements the core ordering domain: menu browsing, guest/account order
placement with online payment, per-Order-Item independent cooking and
cancellation, dynamic Machine-Tag pool assignment, and multi-step recipes
(see docs/adr/0001-0003). Adds a guest-access-token / session-based
ownership check on every read/mutation so an order can't be viewed,
cancelled, or picked up by anyone but its owner.

Covered by 14 tests running the domain layer directly against a real,
ephemeral Postgres (testcontainers) — createServerFn couldn't be called
outside a real request context, so tests exercise the domain functions the
server functions thinly wrap instead of the server functions themselves.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tsconfig.json

@@ -0,0 +1,29 @@
+{
+  "include": ["**/*.ts", "**/*.tsx", "eslint.config.js", "prettier.config.js", "vite.config.js"],
+  
+  "compilerOptions": {
+    "target": "ES2022",
+    "jsx": "react-jsx",
+    "module": "ESNext",
+    "paths": {
+      "#/*": ["./src/*"],
+      "@/*": ["./src/*"]
+    },
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "types": ["vite/client"],
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    /* Linting */
+    "skipLibCheck": true,
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedSideEffectImports": true
+  }
+}