feat(social): follows, favorites, comments, reactions, collections, public profiles

Follow/unfollow users. Recipe favorites. Threaded comments with emoji reactions.
Collections (public/private) with shared member invite. Activity feed.
Public profile pages at /u/[username].

apps/web/app/api/v1/users/me/route.ts

@@ -0,0 +1,21 @@
+import { NextResponse } from "next/server";
+import { headers } from "next/headers";
+import { auth } from "@/lib/auth/server";
+import { db, users, eq } from "@epicure/db";
+import { z } from "zod";
+
+const PatchSchema = z.object({
+  name: z.string().min(1).max(100).optional(),
+  locale: z.string().max(10).optional(),
+});
+
+export async function PATCH(req: Request) {
+  const session = await auth.api.getSession({ headers: await headers() });
+  if (!session) return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+
+  const body = PatchSchema.safeParse(await req.json());
+  if (!body.success) return NextResponse.json({ error: body.error.flatten() }, { status: 400 });
+
+  await db.update(users).set(body.data).where(eq(users.id, session.user.id));
+  return NextResponse.json({ ok: true });
+}