feat(saas): update schema for db-per-tenant and per-component FIEL encryption

- Rename Tenant.schemaName to databaseName across all services
- Add Subscription and Payment models to Prisma schema
- Update FielCredential to per-component IV/tag encryption columns
- Switch FIEL encryption key from JWT_SECRET to FIEL_ENCRYPTION_KEY
- Add Subscription and Payment shared types
- Update JWTPayload to use databaseName

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

apps/api/src/services/fiel.service.ts

@@ -58,15 +58,19 @@ export async function uploadFiel(
       };
     }
     
-    // Encriptar credenciales (todas juntas con el mismo IV/tag)
+    // Encriptar credenciales (per-component IV/tag)
     const {
       encryptedCer,
       encryptedKey,
       encryptedPassword,
-      iv,
-      tag,
+      cerIv,
+      cerTag,
+      keyIv,
+      keyTag,
+      passwordIv,
+      passwordTag,
     } = encryptFielCredentials(cerData, keyData, password);
-    
+
     // Guardar o actualizar en BD
     await prisma.fielCredential.upsert({
       where: { tenantId },
@@ -76,8 +80,12 @@ export async function uploadFiel(
         cerData: encryptedCer,
         keyData: encryptedKey,
         keyPasswordEncrypted: encryptedPassword,
-        encryptionIv: iv,
-        encryptionTag: tag,
+        cerIv,
+        cerTag,
+        keyIv,
+        keyTag,
+        passwordIv,
+        passwordTag,
         serialNumber,
         validFrom,
         validUntil,
@@ -88,8 +96,12 @@ export async function uploadFiel(
         cerData: encryptedCer,
         keyData: encryptedKey,
         keyPasswordEncrypted: encryptedPassword,
-        encryptionIv: iv,
-        encryptionTag: tag,
+        cerIv,
+        cerTag,
+        keyIv,
+        keyTag,
+        passwordIv,
+        passwordTag,
         serialNumber,
         validFrom,
         validUntil,
@@ -198,13 +210,17 @@ export async function getDecryptedFiel(tenantId: string): Promise<{
   }
 
   try {
-    // Desencriptar todas las credenciales juntas
+    // Desencriptar credenciales (per-component IV/tag)
     const { cerData, keyData, password } = decryptFielCredentials(
       Buffer.from(fiel.cerData),
       Buffer.from(fiel.keyData),
       Buffer.from(fiel.keyPasswordEncrypted),
-      Buffer.from(fiel.encryptionIv),
-      Buffer.from(fiel.encryptionTag)
+      Buffer.from(fiel.cerIv),
+      Buffer.from(fiel.cerTag),
+      Buffer.from(fiel.keyIv),
+      Buffer.from(fiel.keyTag),
+      Buffer.from(fiel.passwordIv),
+      Buffer.from(fiel.passwordTag)
     );
 
     return {