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>

package-lock.json

@@ -12,6 +12,7 @@
         "ajv": "^8.17.1",
         "cors": "^2.8.5",
         "csv-parse": "^6.1.0",
+        "dbmate": "^2.0.0",
         "dotenv": "^17.2.3",
         "express": "^4.19.2",
         "mysql2": "^3.16.2",
@@ -22,7 +23,6 @@
       },
       "devDependencies": {
         "@vitest/coverage-v8": "^4.0.18",
-        "dbmate": "^2.0.0",
         "nodemon": "^3.0.3",
         "vitest": "^4.0.18"
       }
@@ -94,7 +94,6 @@
       "cpu": [
         "arm64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
@@ -108,7 +107,6 @@
       "cpu": [
         "x64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
@@ -122,7 +120,6 @@
       "cpu": [
         "arm"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
@@ -136,7 +133,6 @@
       "cpu": [
         "arm64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
@@ -150,7 +146,6 @@
       "cpu": [
         "ia32"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
@@ -164,7 +159,6 @@
       "cpu": [
         "x64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
@@ -178,7 +172,6 @@
       "cpu": [
         "x64"
       ],
-      "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
@@ -1466,7 +1459,6 @@
       "version": "2.28.0",
       "resolved": "https://registry.npmjs.org/dbmate/-/dbmate-2.28.0.tgz",
       "integrity": "sha512-kbJ+Aqna/SOsS86RuimX8X/qmo9ItG00EYMUfUQmo3xGoXBac4+PZwOYV0fVPIGakIRljNolhfJySkPAFjmZsA==",
-      "dev": true,
       "license": "MIT",
       "bin": {
         "dbmate": "dist/cli.js"