fix: force-dynamic on all API routes + PWA manifest & service worker

- Add export const dynamic = "force-dynamic" to routes previously
  pre-rendered as static (rate-probabilities, news, fx, yields, calendar)
  → fixes empty data on Vercel where static pre-render got HTTP 403
- Add PWA: manifest.json, sw.js, icons, layout meta + apple-touch-icon

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/api/calendar/route.ts

@@ -1,6 +1,8 @@
 import { NextResponse } from "next/server";
 import rateDecisionsData from "@/data/rate_decisions.json";
 import { fetchFFEvents, nextWeekAvailable } from "@/lib/forexfactory";
+
+export const dynamic = "force-dynamic";
 import type { FFEvent } from "@/lib/forexfactory";
 import type { Currency } from "@/lib/types";
 import { fetchAllCBPaths, extractMeetingEvents } from "@/lib/rateprobability";

app/api/fx/route.ts

@@ -1,5 +1,7 @@
 import { NextResponse } from "next/server";
 
+export const dynamic = "force-dynamic";
+
 const CURRENCIES = ["EUR", "GBP", "JPY", "CHF", "CAD", "AUD", "NZD", "SEK"];
 const AV_BASE    = "https://www.alphavantage.co/query";
 

app/api/news/route.ts

@@ -2,6 +2,8 @@ import { NextResponse } from "next/server";
 import { fetchAllNews } from "@/lib/newsfeed";
 import type { NewsItem } from "@/lib/newsfeed";
 
+export const dynamic = "force-dynamic";
+
 export type { NewsItem } from "@/lib/newsfeed";
 
 let _cache: { data: NewsItem[]; ts: number } | null = null;

app/api/rate-probabilities/route.ts

@@ -2,6 +2,8 @@ import { NextResponse } from "next/server";
 import { fetchAllCBPaths } from "@/lib/rateprobability";
 import type { RateProbData } from "@/lib/rateprobability";
 
+export const dynamic = "force-dynamic";
+
 export type { RateProbData, CBRatePath, RateProbMeeting } from "@/lib/rateprobability";
 
 export interface RateProbabilitiesResponse {

app/api/yields/route.ts

@@ -1,6 +1,8 @@
 import { NextResponse } from "next/server";
 import { fetchTEBondYields } from "@/lib/tebonds";
 
+export const dynamic = "force-dynamic";
+
 // Variation % d'un pair FX vs clôture J-1 (Yahoo Finance, cache 5 min)
 // Valeur positive = devise X plus forte vs USD (ou USD plus fort si pair inversé)
 async function fxChangePct(symbol: string, invert = false): Promise<number | null> {