Add B2B reformista panel with Postgres/Drizzle data layer

Modela el funnel del lead en dos dimensiones (pipeline_stage técnico
de 7 pasos + estado comercial de 6 estados) y siembra 11 leads demo,
uno por cada momento del funnel, para analizar el siguiente paso.
Incluye panel /panel (lista + detalle RF-D-01/02) y wiring de deploy
(Dockerfile multi-stage + entrypoint migrate+seed).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

mvp/b2c/package.json

@@ -6,12 +6,19 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "db:generate": "drizzle-kit generate",
+    "db:migrate": "drizzle-kit migrate",
+    "db:push": "drizzle-kit push",
+    "db:studio": "drizzle-kit studio",
+    "db:seed": "tsx src/db/seed.ts"
   },
   "dependencies": {
     "@tailwindcss/postcss": "^4.3.0",
+    "drizzle-orm": "^0.45.2",
     "next": "16.2.6",
     "postcss": "^8.5.15",
+    "postgres": "^3.4.9",
     "react": "19.2.4",
     "react-dom": "19.2.4",
     "tailwindcss": "^4.3.0"
@@ -20,8 +27,11 @@
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",
+    "dotenv": "^17.4.2",
+    "drizzle-kit": "^0.31.10",
     "eslint": "^9",
     "eslint-config-next": "16.2.6",
+    "tsx": "^4.22.3",
     "typescript": "^5"
   }
 }