feat: port contexts layer and MCP parity

app/api/contexts/route.ts

@@ -0,0 +1,47 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { contextService } from '@/services/database';
+
+export const runtime = 'nodejs';
+
+export async function GET() {
+  try {
+    const contexts = await contextService.listContexts();
+    return NextResponse.json({ success: true, data: contexts });
+  } catch (error) {
+    return NextResponse.json({ success: false, error: error instanceof Error ? error.message : 'Failed to fetch contexts' }, { status: 500 });
+  }
+}
+
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json();
+    const context = await contextService.createContext({
+      name: body.name,
+      description: body.description,
+      icon: body.icon,
+    });
+    return NextResponse.json({ success: true, data: context }, { status: 201 });
+  } catch (error) {
+    return NextResponse.json({ success: false, error: error instanceof Error ? error.message : 'Failed to create context' }, { status: 400 });
+  }
+}
+
+export async function PUT(request: NextRequest) {
+  try {
+    const body = await request.json();
+    if (typeof body.id !== 'number' || !Number.isInteger(body.id) || body.id <= 0) {
+      return NextResponse.json({ success: false, error: 'Context id is required' }, { status: 400 });
+    }
+
+    const context = await contextService.updateContext({
+      id: body.id,
+      name: body.name,
+      description: body.description,
+      icon: body.icon,
+    });
+
+    return NextResponse.json({ success: true, data: context });
+  } catch (error) {
+    return NextResponse.json({ success: false, error: error instanceof Error ? error.message : 'Failed to update context' }, { status: 400 });
+  }
+}