fix: instant CMS uploads + heritage dark/light + ISR caching

Eliminates the need to run "docker compose build" after uploading
images via HQ Command. Heritage page now respects light/dark mode.

CACHE INVALIDATION
- New helper src/lib/revalidate.ts called from /api/assets and
  /api/public-upload after every upload, delete, folder create
- Pages switch from force-dynamic to ISR with revalidate=60
  (regenerated on demand whenever content changes, plus 60s safety)
- Nginx now sends "max-age=300, must-revalidate" instead of "expires 30d"
  on /cases/, /applications/, /news/, /parts/, /footage/, /operations-inbox/
  so browsers revalidate via If-Modified-Since (304s on unchanged files)
- Next.js Image Optimizer aligned with same TTL via minimumCacheTTL=300
  and adds /_next/image location block in Nginx for correct headers

HERITAGE DARK/LIGHT FIX (Bug #8)
- Replaces hardcoded #0A0A0C / #00F0FF / text-white with proper
  light + dark variants throughout markdown renderer (tables, lists,
  headings, blockquotes, paragraphs, images)
- Hero section, navigation pill, and CMS-driven sections now switch
  with the global theme toggle

SECURITY HARDENING
- Server actions bodySizeLimit reduced from 500MB to 50MB
  (large uploads still go through /api/assets which uses Nginx 500MB cap)

DEPLOY NOTES
- Run on VPS:
    git pull
    docker compose up -d --build app
    docker compose exec nginx nginx -s reload
- No DB schema changes in this commit. Existing 2FA users / data untouched.

src/app/[locale]/applications/[slug]/page.tsx

@@ -1,4 +1,5 @@
-export const dynamic = "force-dynamic";
+// ISR: revalidates every 60s + on-demand via revalidatePath after CMS uploads.
+export const revalidate = 60;
 
 import Link from "next/link";
 import fs from "fs";
@@ -46,8 +47,6 @@ export async function generateStaticParams() {
   }
 }
 
-export const revalidate = 60; 
-
 // 🔥 AHORA RECIBIMOS EL LOCALE DESDE LA URL
 export default async function ApplicationPage({ params }: { params: Promise<{ slug: string, locale: string }> }) {
   const resolvedParams = await params;