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/lib/api.ts

@@ -90,7 +90,7 @@ export type SeriesDto = {
 };
 
 function config() {
-  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;
   if (!token) {
     throw new Error("API_BOOTSTRAP_TOKEN is required for backoffice");