feat: add agent-first minitool studio MVP

app/api/projects/[id]/build/route.ts

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+import { NextResponse } from "next/server";
+import { buildProject } from "../../../../../lib/build";
+import { errorResponse } from "../../../../../lib/http";
+import { touchProject } from "../../../../../lib/storage";
+
+export const runtime = "nodejs";
+export const maxDuration = 60;
+
+export async function POST(_: Request, context: { params: Promise<{ id: string }> }) {
+  try {
+    const { id } = await context.params;
+    await touchProject(id);
+    const result = await buildProject(id);
+    return NextResponse.json({ report: result.report, previewUrl: `/api/projects/${id}/preview/index.html` });
+  } catch (error) { return errorResponse(error); }
+}

app/api/projects/[id]/dependencies/install/route.ts

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+import { NextResponse } from "next/server";
+import { installProjectDependencies } from "../../../../../../../lib/build";
+import { errorResponse } from "../../../../../../../lib/http";
+import { touchProject } from "../../../../../../../lib/storage";
+
+export const runtime = "nodejs";
+export const maxDuration = 120;
+
+export async function POST(_: Request, context: { params: Promise<{ id: string }> }) {
+  try {
+    const { id } = await context.params;
+    await touchProject(id);
+    return NextResponse.json(await installProjectDependencies(id));
+  } catch (error) { return errorResponse(error); }
+}

app/api/projects/[id]/files/[...path]/route.ts

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+import { NextRequest, NextResponse } from "next/server";
+import { errorResponse } from "../../../../../../lib/http";
+import { readProjectFile, writeProjectFiles } from "../../../../../../lib/storage";
+
+export const runtime = "nodejs";
+
+type Context = { params: Promise<{ id: string; path: string[] }> };
+
+export async function GET(_: NextRequest, context: Context) {
+  try {
+    const params = await context.params;
+    return NextResponse.json({ content: await readProjectFile(params.id, params.path) });
+  } catch (error) { return errorResponse(error); }
+}
+
+export async function PUT(request: NextRequest, context: Context) {
+  try {
+    const params = await context.params;
+    const body = await request.json();
+    if (typeof body.content !== "string") throw new Error("content must be a string");
+    const project = await writeProjectFiles(params.id, [{ path: params.path.join("/"), content: body.content }], body.revision);
+    return NextResponse.json({ project });
+  } catch (error) { return errorResponse(error); }
+}

app/api/projects/[id]/package/route.ts

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+import { NextResponse } from "next/server";
+import { packageProject } from "../../../../../lib/build";
+import { errorResponse } from "../../../../../lib/http";
+import { touchProject } from "../../../../../lib/storage";
+
+export const runtime = "nodejs";
+export const maxDuration = 60;
+
+export async function POST(_: Request, context: { params: Promise<{ id: string }> }) {
+  try {
+    const { id } = await context.params;
+    await touchProject(id);
+    const result = await packageProject(id);
+    return NextResponse.json({ report: result.report, artifactUrl: result.zipPath ? `/api/artifacts/${id}/minitool.zip` : undefined });
+  } catch (error) { return errorResponse(error); }
+}

app/api/projects/[id]/patch/route.ts

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+import { NextRequest, NextResponse } from "next/server";
+import { errorResponse } from "../../../../../lib/http";
+import { writeProjectFiles } from "../../../../../lib/storage";
+
+export const runtime = "nodejs";
+
+export async function POST(request: NextRequest, context: { params: Promise<{ id: string }> }) {
+  try {
+    const { id } = await context.params;
+    const body = await request.json();
+    if (!Array.isArray(body.changes) || body.changes.some((item: unknown) => !item || typeof (item as { path?: unknown }).path !== "string" || typeof (item as { content?: unknown }).content !== "string")) throw new Error("changes must contain path and content strings");
+    return NextResponse.json({ project: await writeProjectFiles(id, body.changes, body.revision) });
+  } catch (error) { return errorResponse(error); }
+}

app/api/projects/[id]/preview/[[...path]]/route.ts

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+import fs from "node:fs/promises";
+import path from "node:path";
+import { NextResponse } from "next/server";
+import { buildProject } from "../../../../../../lib/build";
+import { errorResponse } from "../../../../../../lib/http";
+import { projectRoot, touchProject } from "../../../../../../lib/storage";
+
+export const runtime = "nodejs";
+
+const CONTENT_TYPES: Record<string, string> = { ".html": "text/html; charset=utf-8", ".css": "text/css; charset=utf-8", ".js": "text/javascript; charset=utf-8", ".json": "application/json", ".png": "image/png", ".jpg": "image/jpeg", ".jpeg": "image/jpeg", ".gif": "image/gif", ".webp": "image/webp", ".svg": "image/svg+xml", ".woff": "font/woff", ".woff2": "font/woff2" };
+
+export async function GET(_: Request, context: { params: Promise<{ id: string; path?: string[] }> }) {
+  try {
+    const params = await context.params;
+    await touchProject(params.id);
+    const segments = params.path?.length ? params.path : ["index.html"];
+    const dist = path.join(projectRoot(params.id), "dist");
+    let target = path.resolve(dist, ...segments);
+    if (!target.startsWith(`${dist}${path.sep}`)) throw new Error("Invalid preview path");
+    try { await fs.access(target); } catch { await buildProject(params.id); target = path.resolve(dist, ...segments); }
+    return new NextResponse(await fs.readFile(target), { headers: { "Content-Type": CONTENT_TYPES[path.extname(target)] || "application/octet-stream", "Cache-Control": "no-store" } });
+  } catch (error) { return errorResponse(error); }
+}

app/api/projects/[id]/route.ts

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+import { NextResponse } from "next/server";
+import { errorResponse } from "../../../../lib/http";
+import { getProject, listFiles } from "../../../../lib/storage";
+
+export const runtime = "nodejs";
+
+export async function GET(_: Request, context: { params: Promise<{ id: string }> }) {
+  try {
+    const { id } = await context.params;
+    const [project, files] = await Promise.all([getProject(id), listFiles(id)]);
+    return NextResponse.json({ project, files });
+  } catch (error) { return errorResponse(error); }
+}

app/api/projects/[id]/validate/route.ts

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+import { NextResponse } from "next/server";
+import { buildProject } from "../../../../../lib/build";
+import { errorResponse } from "../../../../../lib/http";
+import { touchProject } from "../../../../../lib/storage";
+
+export const runtime = "nodejs";
+
+export async function POST(_: Request, context: { params: Promise<{ id: string }> }) {
+  try {
+    const { id } = await context.params;
+    await touchProject(id);
+    const result = await buildProject(id);
+    return NextResponse.json({ report: result.report });
+  } catch (error) { return errorResponse(error); }
+}

app/api/projects/route.ts

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+import { NextRequest, NextResponse } from "next/server";
+import { createProject, listProjects } from "../../../lib/storage";
+import { errorResponse } from "../../../lib/http";
+
+export const runtime = "nodejs";
+
+export async function GET() {
+  try { return NextResponse.json({ projects: await listProjects() }); }
+  catch (error) { return errorResponse(error); }
+}
+
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json().catch(() => ({}));
+    return NextResponse.json({ project: await createProject(body) }, { status: 201 });
+  } catch (error) { return errorResponse(error); }
+}