feat: complete v0.5 operations foundation

app/api/reports/route.ts

@@ -0,0 +1,17 @@
+import { NextResponse } from "next/server";
+import { requireUser } from "@/lib/auth";
+import { db } from "@/lib/db";
+import { externalUrl } from "@/lib/http";
+import { requireSameOrigin } from "@/lib/security";
+
+export async function POST(request: Request) {
+  try {
+    requireSameOrigin(request); const user = await requireUser(); const form = await request.formData();
+    const postId = Number(form.get("postId")); const reason = String(form.get("reason") || "").trim();
+    if (!postId || reason.length < 3 || reason.length > 500) throw new Error("Invalid report");
+    const post = db.prepare("SELECT id FROM posts WHERE id=? AND hidden=0").get(postId);
+    if (!post) throw new Error("Post not found");
+    db.prepare("INSERT INTO reports(post_id,reporter_id,reason) SELECT ?,?,? WHERE NOT EXISTS (SELECT 1 FROM reports WHERE post_id=? AND reporter_id=? AND resolved=0)").run(postId, user.id, reason, postId, user.id);
+    return NextResponse.redirect(externalUrl(request, `/posts/${postId}?reported=1`));
+  } catch { return NextResponse.redirect(externalUrl(request, "/")); }
+}