security: widen API-key auth to content/AI routes (v0.27.0)

Convert requireSession -> requireSessionOrApiKey across recipes,
collections, meal-plans, shopping-lists, pantry, feed, and ai/*
(52 routes) so API keys work end-to-end, not just for the handful of
endpoints that supported them before. Scope was explicitly confirmed
per-resource-family with the user before any file was touched.

Left session-cookie-only, deliberately: users/me*, ai-keys/*,
webhooks/*, conversations/*, notifications/*, push/subscribe, admin/*
— account/credential-adjacent surface that shouldn't widen without a
separate, explicit decision.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/app/api/v1/recipes/[id]/comments/route.ts

@@ -1,7 +1,7 @@
 import { NextRequest, NextResponse } from "next/server";
 import { z } from "zod";
 import { db, recipes, comments, users, userBlocks, eq, and, inArray, isNull, sql } from "@epicure/db";
-import { requireSession } from "@/lib/api-auth";
+import { requireSessionOrApiKey } from "@/lib/api-auth";
 import { applyRateLimit } from "@/lib/rate-limit";
 import { dispatchWebhook } from "@/lib/webhooks";
 import { createNotification } from "@/lib/notifications";
@@ -34,7 +34,7 @@ export async function GET(req: NextRequest, { params }: Params) {
     return NextResponse.json({ error: "Not found" }, { status: 404 });
   }
 
-  const { session } = await requireSession();
+  const { session } = await requireSessionOrApiKey(req);
 
   const { searchParams } = req.nextUrl;
   const limitRaw = parseInt(searchParams.get("limit") ?? "20");
@@ -88,7 +88,7 @@ export async function GET(req: NextRequest, { params }: Params) {
 }
 
 export async function POST(req: NextRequest, { params }: Params) {
-  const { session, response } = await requireSession();
+  const { session, response } = await requireSessionOrApiKey(req);
   if (response) return response;
   const { id } = await params;