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/app/api/settings/cache/clear/route.ts

@@ -2,7 +2,7 @@ import { NextRequest, NextResponse } from "next/server";
 
 export async function POST(request: NextRequest) {
   try {
-    const baseUrl = process.env.API_BASE_URL || "http://api:8080";
+    const baseUrl = process.env.API_BASE_URL || "http://api:7080";
     const token = process.env.API_BOOTSTRAP_TOKEN;
     
     const response = await fetch(`${baseUrl}/settings/cache/clear`, {