feat: migrate to PostgreSQL + SQLAlchemy ORM, rebrand to Nexus Autoparts

- Migrate from SQLite to PostgreSQL with normalized schema
- Add 11 lookup tables (fuel_type, body_type, drivetrain, transmission,
  materials, position_part, manufacture_type, quality_tier, countries,
  reference_type, shapes)
- Rewrite dashboard/server.py (76 routes) using SQLAlchemy text() queries
- Rewrite console/db.py (27 methods) using SQLAlchemy ORM
- Add models.py with 27 SQLAlchemy model definitions
- Add config.py for centralized DB_URL configuration
- Add migrate_to_postgres.py migration script
- Add docs/METABASE_GUIDE.md with complete data entry guide
- Rebrand from "AUTOPARTS DB" to "NEXUS AUTOPARTS"
- Fill vehicle data gaps via NHTSA API + heuristics:
  engines (cylinders, power, torque), brands (country, founded_year),
  models (body_type, production years), MYE (drivetrain, transmission, trim)

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

console/config.py

@@ -1,18 +1,18 @@
 """
-Configuration settings for the AUTOPARTES console application.
+Configuration settings for the NEXUS AUTOPARTS console application.
 """
 
 import os
+import sys
 
 # Application metadata
-VERSION = "1.0.0"
-APP_NAME = "AUTOPARTES"
-APP_SUBTITLE = "Sistema de Catalogo de Autopartes"
+VERSION = "2.0.0"
+APP_NAME = "NEXUS AUTOPARTS"
+APP_SUBTITLE = "Tu conexión directa con las partes que necesitas"
 
-# Database path (relative to the console/ directory, resolved to absolute)
-_CONSOLE_DIR = os.path.dirname(os.path.abspath(__file__))
-DB_PATH = os.path.join(_CONSOLE_DIR, "..", "vehicle_database", "vehicle_database.db")
-DB_PATH = os.path.normpath(DB_PATH)
+# Database URL (PostgreSQL)
+sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), '..'))
+from config import DB_URL
 
 # NHTSA VIN Decoder API
 NHTSA_API_URL = "https://vpic.nhtsa.dot.gov/api/vehicles/DecodeVin"