Remove internal Gitea URLs, personal email, and add AI prompts to site

- Replace all homegit.gyozamancave.fr links with internal page links
  or plain text (no external repo exposure)
- Replace piron.antoine@gmail.com with contact@example.com placeholder
- Add prompts verbatim section to /transparence page (filter, synthesis,
  law-check prompts) via new src/lib/prompts.ts module

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

artifacts/voix-du-peuple/src/pages/contributions-brutes.tsx

@@ -179,9 +179,8 @@ export default function ContributionsBrutes() {
         <p className="text-xs text-muted-foreground/60 font-mono pt-8 mt-8 border-t border-border/30">
           Contributions modérées selon le droit international des droits humains (DUDH · PIDCP · CEDH).{" "}
           <a
-            href="https://homegit.gyozamancave.fr/billisdead/la-voix-du-peuple/src/branch/main/docs/PROMPTS_IA.md"
+            href="/transparence"
             className="underline text-primary"
-            rel="noopener noreferrer"
           >
             Voir les critères de modération
           </a>