feat(backend): add standalone data plane

Replace the Supabase application data plane with the Node/PostgreSQL API, migrate mobile, admin, web, and MCP callers, add controlled cutover tooling, and define hardened Dokploy infrastructure.

apps/api/src/domains/packs/routes.ts

@@ -0,0 +1,46 @@
+import type { ApiErrorResponse } from '@sauci/shared';
+import type { Hono } from 'hono';
+import { z } from 'zod';
+import type { AuthIdentity } from '../../auth.js';
+import { PacksDomainError, type PacksRepository } from './repository.js';
+
+type PacksApp = Hono<{ Variables: { identity: AuthIdentity } }>;
+
+const uuidSchema = z.string().uuid();
+const toggleSchema = z.object({ enabled: z.boolean() }).strict();
+
+function error(code: string, message: string): ApiErrorResponse {
+  return { error: { code, message } };
+}
+
+export function registerPackRoutes(app: PacksApp, repository: PacksRepository): void {
+  app.get('/v1/packs', async (c) => {
+    const showAll = c.req.query('showAllIntensities') === 'true';
+    return c.json(await repository.getCatalog(c.get('identity').id, showAll));
+  });
+
+  app.get('/v1/me/enabled-packs', async (c) =>
+    c.json(await repository.getEnabledPacks(c.get('identity').id)));
+
+  app.put('/v1/me/enabled-packs/:packId', async (c) => {
+    const packId = uuidSchema.safeParse(c.req.param('packId'));
+    if (!packId.success) return c.json(error('invalid_pack_id', 'Pack ID must be a UUID'), 400);
+    const body = toggleSchema.safeParse(await c.req.json().catch(() => null));
+    if (!body.success) return c.json(error('invalid_request', 'enabled must be a boolean'), 400);
+    try {
+      return c.json(await repository.setPackEnabled(c.get('identity').id, packId.data, body.data.enabled));
+    } catch (cause) {
+      if (cause instanceof PacksDomainError && cause.code === 'no_couple') {
+        return c.json(error('no_couple', 'Join a couple before changing packs'), 409);
+      }
+      if (cause instanceof PacksDomainError && cause.code === 'pack_not_found') {
+        return c.json(error('pack_not_found', 'Pack was not found'), 404);
+      }
+      throw cause;
+    }
+  });
+
+  app.get('/v1/me/pack-progress', async (c) =>
+    c.json(await repository.getPackProgress(c.get('identity').id)));
+}
+