docs: add AGENTS.md per module and unify ports to 70XX

- Add CLAUDE.md at root and AGENTS.md in apps/api, apps/indexer,
  apps/backoffice, crates/parsers with module-specific guidelines
- Unify all service ports to 70XX (no more internal/external split):
  API 7080, Indexer 7081, Backoffice 7082
- Update docker-compose.yml, Dockerfiles, config.rs defaults,
  .env.example, backoffice routes, bench.sh, smoke.sh

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

apps/backoffice/Dockerfile

@@ -12,11 +12,11 @@ RUN npm run build
 FROM node:22-alpine AS runner
 WORKDIR /app
 ENV NODE_ENV=production
-ENV PORT=8082
+ENV PORT=7082
 ENV HOST=0.0.0.0
 RUN apk add --no-cache wget
 COPY --from=builder /app/.next/standalone ./
 COPY --from=builder /app/.next/static ./.next/static
 COPY --from=builder /app/public ./public
-EXPOSE 8082
+EXPOSE 7082
 CMD ["node", "server.js"]