feat(api): create unified API server with first 3 modules

New consolidated Hono/Bun API server at apps/api/ that replaces individual
app servers. One process, one port, one auth middleware, one container.

Modules ported:
- calendar: RRULE expansion, ICS import, Google Calendar (stub)
- contacts: avatar upload (S3), vCard import/parsing
- mukke: audio upload/download presigned URLs, batch cover art

Architecture: each module registers routes under /api/v1/{module}/*
using the shared-hono middleware stack (auth, rate limit, error handler).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/api/src/index.ts

@@ -0,0 +1,44 @@
+/**
+ * ManaCore Unified API Server
+ *
+ * Consolidates all app compute servers into one Hono/Bun process.
+ * Each module registers its routes under /api/v1/{module}/*.
+ */
+
+import { Hono } from 'hono';
+import { cors } from 'hono/cors';
+import {
+	authMiddleware,
+	healthRoute,
+	errorHandler,
+	notFoundHandler,
+	rateLimitMiddleware,
+} from '@manacore/shared-hono';
+
+// Module routes
+import { calendarRoutes } from './modules/calendar/routes';
+import { contactsRoutes } from './modules/contacts/routes';
+import { mukkeRoutes } from './modules/mukke/routes';
+
+const PORT = parseInt(process.env.PORT || '3050', 10);
+const CORS_ORIGINS = (process.env.CORS_ORIGINS || 'http://localhost:5173').split(',');
+
+const app = new Hono();
+
+// ─── Global Middleware ──────────────────────────────────────
+app.onError(errorHandler);
+app.notFound(notFoundHandler);
+app.use('*', cors({ origin: CORS_ORIGINS, credentials: true }));
+app.route('/health', healthRoute('mana-api'));
+app.use('/api/*', rateLimitMiddleware({ max: 200, windowMs: 60_000 }));
+app.use('/api/*', authMiddleware());
+
+// ─── Module Routes ──────────────────────────────────────────
+app.route('/api/v1/calendar', calendarRoutes);
+app.route('/api/v1/contacts', contactsRoutes);
+app.route('/api/v1/mukke', mukkeRoutes);
+
+// ─── Server Info ────────────────────────────────────────────
+console.log(`mana-api starting on port ${PORT}...`);
+
+export default { port: PORT, fetch: app.fetch };