feat: P2.8 Resources/Equipment Booking (PostgreSQL + VNCdirectory)

- PostgreSQL schema: resources + resources_bookings tables with indexes
- Server-side client with PG pool + in-memory fallback for dev
- API routes: list, get, availability check, book, cancel
- Resource store (Zustand) for client-side state
- ResourcePicker component: type filter, search, availability dots
- Integrated into event-modal: auto-book on save, auto-cancel on delete
- Integrated into free-busy-view: resource availability rows

app/api/resources/[id]/availability/route.ts

@@ -0,0 +1,31 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { logger } from '@/lib/logger';
+import { getStalwartCredentials } from '@/lib/stalwart/credentials';
+import { checkAvailability } from '@/lib/resources/client';
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string }> },
+) {
+  try {
+    const creds = await getStalwartCredentials(request);
+    if (!creds) {
+      return NextResponse.json({ error: 'Not authenticated' }, { status: 401 });
+    }
+
+    const { id } = await params;
+    const { searchParams } = new URL(request.url);
+    const start = searchParams.get('start');
+    const end = searchParams.get('end');
+
+    if (!start || !end) {
+      return NextResponse.json({ error: 'start and end query parameters are required' }, { status: 400 });
+    }
+
+    const result = await checkAvailability(id, start, end);
+    return NextResponse.json(result);
+  } catch (error) {
+    logger.error('Resource availability error', { error: error instanceof Error ? error.message : 'Unknown' });
+    return NextResponse.json({ error: 'Internal server error' }, { status: 500 });
+  }
+}