Add oRPC API contract with Zod schemas

- Create @reviq/api-contract package
- Define Zod schemas for all input/output types:
  - Auth schemas (signup, login, password reset, WebAuthn)
  - User/profile schemas
  - Organization schemas (CRUD, members, invites)
  - Admin procedure schemas
- Define oRPC contract with full procedure signatures:
  - auth.* (signup, login, password reset, WebAuthn)
  - me.* (profile, sessions, devices, passkeys)
  - orgs.* (CRUD, members, invites, sites)
  - admin.* (orgs, users, auth management)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/api-contract/eslint.config.js

@@ -0,0 +1,12 @@
+import { configs } from "@macalinao/eslint-config";
+
+export default [
+  ...configs.fast,
+  {
+    languageOptions: {
+      parserOptions: {
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+];