feat: add Windows project registry API and persistence

src/app/api/projects/route.ts

@@ -0,0 +1,60 @@
+import { NextResponse } from 'next/server';
+
+import { addProject, listProjects, RegistryValidationError, removeProject } from '../../../lib/registry';
+
+export const runtime = 'nodejs';
+
+function projectsPayload(projects: Array<{ path: string }>): { projects: Array<{ path: string }> } {
+  return {
+    projects: projects.map((project) => ({ path: project.path })),
+  };
+}
+
+async function readPathFromBody(request: Request): Promise<string> {
+  let body: unknown;
+  try {
+    body = await request.json();
+  } catch {
+    throw new RegistryValidationError('Request body must be valid JSON.');
+  }
+
+  const path = (body as { path?: unknown }).path;
+  if (typeof path !== 'string' || path.trim().length === 0) {
+    throw new RegistryValidationError('`path` is required and must be a non-empty string.');
+  }
+
+  return path;
+}
+
+export async function GET(): Promise<Response> {
+  const projects = await listProjects();
+  return NextResponse.json(projectsPayload(projects), { status: 200 });
+}
+
+export async function POST(request: Request): Promise<Response> {
+  try {
+    const projectPath = await readPathFromBody(request);
+    const result = await addProject(projectPath);
+    return NextResponse.json(projectsPayload(result.projects), { status: result.added ? 201 : 200 });
+  } catch (error) {
+    if (error instanceof RegistryValidationError) {
+      return NextResponse.json({ error: error.message }, { status: 400 });
+    }
+
+    return NextResponse.json({ error: 'Failed to add project.' }, { status: 500 });
+  }
+}
+
+export async function DELETE(request: Request): Promise<Response> {
+  try {
+    const projectPath = await readPathFromBody(request);
+    const result = await removeProject(projectPath);
+    return NextResponse.json({ removed: result.removed, ...projectsPayload(result.projects) }, { status: 200 });
+  } catch (error) {
+    if (error instanceof RegistryValidationError) {
+      return NextResponse.json({ error: error.message }, { status: 400 });
+    }
+
+    return NextResponse.json({ error: 'Failed to remove project.' }, { status: 500 });
+  }
+}