feat: fase 2+3 — expansion masiva multi-perfil + bug fixes + hardening

Fase 2 (expansion):
- Francesca: +6 etapas matematicas (5-10), +7 etapas lectura (3-9), +2 ortografia
- Sebastian: +8 etapas matematicas (4-11), +6 lectura, +3 historia, +3 geografia, +1 banderas
- Nuevas paginas: ortografia, lectura, geografia, matematicas
- ~900 ejercicios nuevos, paridad ~500 por perfil

Fase 3 (bug fixes + hardening):
- Fix: SessionLog auto-create en grade route
- Fix: engine cache (no borrar antes de revisar)
- Fix: FSRS cards actualizadas en flujo curriculum
- Fix: responseMs real (no hardcodeado 3000)
- Fix: options dentro de content en sebastian etapa-1
- Fix: trazo-letra consonantes crash
- Security: execFileSync anti-command-injection en TTS
- DB: 18 cascade deletes + indices + unique constraints
- APIs debug: reset, state, seed
- Docker: espeak-ng + prisma + user/group
- E2E: 23 tests nuevos (curriculum-flow.spec.ts)
- Code review: tailwind colors, middleware dev mode, eslint config

Verificado: tsc exit 0, build exit 0, 61 E2E tests pass

curriculum/sebastian/etapa-1.ts

@@ -1,18 +1,18 @@
 import type { Stage } from '../types'
 
-const ejercicios = [
+const ejercicios: any[] = [
   {
     id: 'seb-suma-1',
     content: {
       instruction: 'Sumá: 15 + 27',
       audioText: '15 más 27 es',
       emoji: '➕',
+      options: [
+        { label: '42', correct: true, id: '42' },
+        { label: '40', correct: false, id: '40' },
+        { label: '45', correct: false, id: '45' },
+      ],
     },
-    options: [
-      { label: '42', correct: true, id: '42' },
-      { label: '40', correct: false, id: '40' },
-      { label: '45', correct: false, id: '45' },
-    ],
   },
   {
     id: 'seb-suma-2',
@@ -20,12 +20,12 @@ const ejercicios = [
       instruction: 'Sumá: 34 + 56',
       audioText: '34 más 56 es',
       emoji: '➕',
+      options: [
+        { label: '90', correct: true, id: '90' },
+        { label: '80', correct: false, id: '80' },
+        { label: '100', correct: false, id: '100' },
+      ],
     },
-    options: [
-      { label: '90', correct: true, id: '90' },
-      { label: '80', correct: false, id: '80' },
-      { label: '100', correct: false, id: '100' },
-    ],
   },
   {
     id: 'seb-suma-3',
@@ -33,12 +33,12 @@ const ejercicios = [
       instruction: 'Sumá: 78 + 22',
       audioText: '78 más 22 es',
       emoji: '➕',
+      options: [
+        { label: '100', correct: true, id: '100' },
+        { label: '99', correct: false, id: '99' },
+        { label: '101', correct: false, id: '101' },
+      ],
     },
-    options: [
-      { label: '100', correct: true, id: '100' },
-      { label: '99', correct: false, id: '99' },
-      { label: '101', correct: false, id: '101' },
-    ],
   },
   {
     id: 'seb-suma-4',
@@ -46,12 +46,12 @@ const ejercicios = [
       instruction: 'Sumá: 45 + 55',
       audioText: '45 más 55 es',
       emoji: '➕',
+      options: [
+        { label: '100', correct: true, id: '100' },
+        { label: '95', correct: false, id: '95' },
+        { label: '110', correct: false, id: '110' },
+      ],
     },
-    options: [
-      { label: '100', correct: true, id: '100' },
-      { label: '95', correct: false, id: '95' },
-      { label: '110', correct: false, id: '110' },
-    ],
   },
   {
     id: 'seb-suma-5',
@@ -59,12 +59,12 @@ const ejercicios = [
       instruction: 'Sumá: 123 + 456',
       audioText: '123 más 456 es',
       emoji: '➕',
+      options: [
+        { label: '579', correct: true, id: '579' },
+        { label: '569', correct: false, id: '569' },
+        { label: '580', correct: false, id: '580' },
+      ],
     },
-    options: [
-      { label: '579', correct: true, id: '579' },
-      { label: '569', correct: false, id: '569' },
-      { label: '580', correct: false, id: '580' },
-    ],
   },
 ]
 
@@ -72,7 +72,8 @@ const exercises: any[] = []
 for (let i = 0; i < ejercicios.length; i++) {
   const e = ejercicios[i]
   exercises.push({
-    ...e,
+    id: e.id,
+    content: e.content,
     stage: 1,
     skillCode: `seb-suma-${i + 1}`,
     type: 'eleccion',