local dev setup + OPENAI_BASE_URL support + dashboard fix

- CLAUDE.md con arquitectura y comandos del proyecto
- env.example: agregar LIMIT_CONVERSATIONS, MAX_CHARS_PER_MESSAGE, OPENAI_BASE_URL
- docker-compose.override: puerto 3001, extra_hosts para modelo local en Linux
- OpenAI clients: soporte OPENAI_BASE_URL para apuntar a modelo local compatible
- stats.js: sync de órdenes en background, dashboard no bloquea al cargar
- package-lock: dbmate movido a prod dependencies

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

CLAUDE.md

@@ -0,0 +1,91 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Commands
+
+```bash
+# Development
+npm run dev          # Start with nodemon auto-reload
+npm start            # Production start
+
+# Testing
+npm test             # Run all tests once (vitest run)
+npm run test:watch   # Watch mode
+npm run test:coverage
+
+# Run a single test file
+npx vitest run src/modules/3-turn-engine/orderModel.test.js
+
+# Database migrations (requires DATABASE_URL in .env)
+npm run migrate:up
+npm run migrate:down
+npm run migrate:redo
+npm run migrate:status
+npm run seed         # Seed a tenant via scripts/seed-tenant.mjs
+```
+
+No lint command is configured.
+
+## Architecture
+
+This is a **multi-tenant WhatsApp e-commerce chatbot** powered by Express.js. Tenants are WooCommerce store operators; their customers interact via WhatsApp to browse products, build carts, and place orders. All database operations are isolated by `tenant_id`.
+
+### Request flow
+
+```
+WhatsApp → Evolution API webhook → /webhook/evolution
+                                         ↓
+                              1-intake: route & normalize message
+                                         ↓
+                              3-turn-engine: NLU → FSM → state handler
+                                         ↓
+                              Response persisted to DB + sent back via Evolution API
+```
+
+### Module structure (numbered layers)
+
+- **`src/modules/0-UI/`** — Admin dashboard: REST controllers for products, conversations, settings, prompts, takeovers, recommendations, aliases. Each controller has a `db/` sub-layer for persistence.
+
+- **`src/modules/1-intake/`** — Message ingestion. Routes: `/simulator` (dev UI), `/webhook/evolution` (WhatsApp). Normalizes incoming messages before passing to turn engine.
+
+- **`src/modules/2-identity/`** — Tenant and user management. Maps WhatsApp numbers to WooCommerce customers. Stores encrypted WooCommerce credentials per tenant in `tenant_ecommerce_config`. Routes WooCommerce webhooks.
+
+- **`src/modules/3-turn-engine/`** — Core logic. NLU classifies intents; FSM transitions states (`IDLE → CART → SHIPPING → PAYMENT → WAITING_WEBHOOKS`). Two NLU versions controlled by `USE_MODULAR_NLU` env flag. Two turn engine versions controlled by `TURN_ENGINE` env flag. State handlers map to FSM states.
+
+- **`src/modules/4-woo-orders/`** — WooCommerce order sync. Fetches and caches customer order history for conversation context.
+
+- **`src/modules/shared/`** — DB pool (PostgreSQL via `pg`), SSE for real-time admin UI updates, WooSnapshot (product catalog cache), debug utilities.
+
+### Key integrations
+
+| System | Purpose | Config |
+|--------|---------|--------|
+| OpenAI | NLU intent classification & response generation | `OPENAI_API_KEY`, `OPENAI_MODEL` |
+| Evolution API | WhatsApp send/receive | `EVOLUTION_API_URL`, `EVOLUTION_API_KEY`, `EVOLUTION_INSTANCE_NAME`, `EVOLUTION_SEND_ENABLED` |
+| WooCommerce REST API | Products, orders, customers | `WOO_*` env vars or per-tenant in DB |
+| PostgreSQL | Primary database | `DATABASE_URL` |
+
+### Database
+
+Migrations live in `db/migrations/` as timestamped SQL files managed by `dbmate`. Key tables:
+- `tenants`, `tenant_config`, `tenant_settings`, `tenant_ecommerce_config`, `tenant_channels`
+- `wa_identity_map` — WhatsApp ↔ WooCommerce customer mapping
+- `wa_conversation_state` — FSM state + context per conversation
+- `wa_messages` — Message history
+- `woo_products_snapshot` — Cached product catalog
+- `prompt_templates` — Versioned LLM prompts
+- `human_takeovers`, `audit_log`, `conversation_runs`
+
+### Feature flags (env vars)
+
+- `TURN_ENGINE=v1|v2` — Which turn engine version to use
+- `USE_MODULAR_NLU=1` — Use modular NLU (prompt templates from DB) vs. v3 hardcoded
+- `EVOLUTION_SEND_ENABLED=1` — Actually send messages to WhatsApp (disable in dev/test)
+- `DEBUG_PERF`, `DEBUG_WOO_HTTP`, `DEBUG_LLM`, `DEBUG_EVOLUTION` — Granular debug logging
+
+### Local development
+
+Copy `env.example` to `.env` and fill in values. Use `docker-compose.override.yaml` for local overrides. Run `docker compose up` to start app + Postgres + Redis. The Dockerfile runs migrations automatically on startup (`migrate:up && seed && start`).
+
+Test files use Vitest with `globals: true` — no need to import `describe`, `it`, `expect`.