feat(api): add @readied/api backend for cloud sync

packages/api/README.md

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+# @readied/api
+
+Backend API for Readied cloud sync. Built with Hono for edge runtime compatibility.
+
+## Features
+
+- **Magic Link Auth** - Passwordless authentication via email
+- **Cloud Sync** - Push/pull encrypted notes across devices
+- **Subscription Management** - Stripe integration for Pro tier
+
+## Deployment
+
+Deployable to:
+- Cloudflare Workers (recommended)
+- Vercel Edge Functions
+- Deno Deploy
+- Any Node.js runtime
+
+## Development
+
+```bash
+# Start dev server
+pnpm dev
+
+# Typecheck
+pnpm typecheck
+
+# Deploy to Cloudflare
+pnpm deploy
+```
+
+## Environment Variables
+
+Set these as secrets in your deployment platform:
+
+| Variable | Description |
+|----------|-------------|
+| `DATABASE_URL` | Neon Postgres connection string |
+| `JWT_SECRET` | Secret for signing JWTs |
+| `RESEND_API_KEY` | API key for Resend email service |
+| `STRIPE_WEBHOOK_SECRET` | Stripe webhook signing secret |
+
+## API Endpoints
+
+### Auth
+- `POST /auth/magic-link` - Request magic link email
+- `POST /auth/verify` - Verify token and get JWT
+- `POST /auth/refresh` - Refresh access token
+- `GET /auth/me` - Get current user (protected)
+
+### Sync
+- `GET /sync?cursor=0` - Pull changes since cursor (protected)
+- `POST /sync` - Push local changes (protected)
+- `GET /sync/status` - Get sync status (protected)
+
+### Subscription
+- `POST /subscription/webhook` - Stripe webhook handler
+- `GET /subscription/status` - Get subscription status (protected)
+- `POST /subscription/portal` - Create Stripe portal session (protected)

packages/api/drizzle.config.ts

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+import { defineConfig } from 'drizzle-kit';
+
+export default defineConfig({
+  schema: './src/db/schema.ts',
+  out: './drizzle',
+  dialect: 'turso',
+  dbCredentials: {
+    url: process.env.TURSO_DATABASE_URL!,
+    authToken: process.env.TURSO_AUTH_TOKEN,
+  },
+});

packages/api/drizzle/0000_chubby_zzzax.sql

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+CREATE TABLE `devices` (
+	`id` text PRIMARY KEY NOT NULL,
+	`user_id` text NOT NULL,
+	`device_id` text NOT NULL,
+	`name` text,
+	`platform` text,
+	`last_seen_at` text NOT NULL,
+	`created_at` text NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE INDEX `idx_devices_user_device` ON `devices` (`user_id`,`device_id`);--> statement-breakpoint
+CREATE UNIQUE INDEX `idx_devices_unique` ON `devices` (`user_id`,`device_id`);--> statement-breakpoint
+CREATE TABLE `magic_links` (
+	`id` text PRIMARY KEY NOT NULL,
+	`user_id` text NOT NULL,
+	`token` text NOT NULL,
+	`expires_at` text NOT NULL,
+	`used_at` text,
+	`created_at` text NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `magic_links_token_unique` ON `magic_links` (`token`);--> statement-breakpoint
+CREATE INDEX `idx_magic_links_token` ON `magic_links` (`token`);--> statement-breakpoint
+CREATE TABLE `subscriptions` (
+	`id` text PRIMARY KEY NOT NULL,
+	`user_id` text NOT NULL,
+	`stripe_customer_id` text,
+	`stripe_subscription_id` text,
+	`status` text DEFAULT 'inactive' NOT NULL,
+	`plan` text DEFAULT 'free' NOT NULL,
+	`trial_ends_at` text,
+	`current_period_end` text,
+	`canceled_at` text,
+	`created_at` text NOT NULL,
+	`updated_at` text NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `subscriptions_user_id_unique` ON `subscriptions` (`user_id`);--> statement-breakpoint
+CREATE TABLE `sync_cursors` (
+	`id` text PRIMARY KEY NOT NULL,
+	`user_id` text NOT NULL,
+	`device_id` text NOT NULL,
+	`last_synced_version` integer DEFAULT 0 NOT NULL,
+	`updated_at` text NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE INDEX `idx_sync_cursors_user_device` ON `sync_cursors` (`user_id`,`device_id`);--> statement-breakpoint
+CREATE UNIQUE INDEX `idx_sync_cursors_unique` ON `sync_cursors` (`user_id`,`device_id`);--> statement-breakpoint
+CREATE TABLE `sync_log` (
+	`id` text PRIMARY KEY NOT NULL,
+	`user_id` text NOT NULL,
+	`note_id` text NOT NULL,
+	`version` integer NOT NULL,
+	`operation` text NOT NULL,
+	`encrypted_data` text,
+	`device_id` text NOT NULL,
+	`created_at` text NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE INDEX `idx_sync_log_user_version` ON `sync_log` (`user_id`,`version`);--> statement-breakpoint
+CREATE INDEX `idx_sync_log_user_note` ON `sync_log` (`user_id`,`note_id`);--> statement-breakpoint
+CREATE TABLE `users` (
+	`id` text PRIMARY KEY NOT NULL,
+	`email` text NOT NULL,
+	`created_at` text NOT NULL,
+	`updated_at` text NOT NULL
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `users_email_unique` ON `users` (`email`);