fix(kobo): sync normalized language and ISBN metadata

Normalize heterogeneous language metadata at the Kobo boundary and include validated ISBN values so device details remain accurate. Version metadata hashes to refresh previously synchronized books.

Fixes #920

pnpm-lock.yaml

@@ -433,6 +433,9 @@ importers:
       jose:
         specifier: ^6.2.4
         version: 6.2.4
+      langs:
+        specifier: ^2.0.0
+        version: 2.0.0
       ms:
         specifier: ^2.1.3
         version: 2.1.3
@@ -518,6 +521,9 @@ importers:
       "@types/express":
         specifier: ^5.0.6
         version: 5.0.6
+      "@types/langs":
+        specifier: ^2.0.5
+        version: 2.0.5
       "@types/node":
         specifier: ^26.1.1
         version: 26.1.1
@@ -5901,6 +5907,12 @@ packages:
         integrity: sha512-asx5hIG9Qmf/1oStypjanR7iKTv0gXQ1Ov/jfrX6kS/EO0OFni8orbmGCn0672NHR3kXHwpAwR+B368ZGN/2rA==,
       }
 
+  "@types/langs@2.0.5":
+    resolution:
+      {
+        integrity: sha512-DIUKT4mkbTBxSrX6lmnQR888ObeFVVo1uNEqBH5/ddQHpnG4CA24DibpK7aO8QAcJEZUTcIx0F96TWuzVT9Z4g==,
+      }
+
   "@types/luxon@3.7.2":
     resolution:
       {
@@ -10413,6 +10425,12 @@ packages:
         integrity: sha512-Y+60/zizpJ3HRH8DCss+q95yr6145JXZo46OTpFvDZWLfRCE4qChOyk1b26nMaNpfHHgxagk9dXT5OP0Tfe+dQ==,
       }
 
+  langs@2.0.0:
+    resolution:
+      {
+        integrity: sha512-v4pxOBEQVN1WBTfB1crhTtxzNLZU9HPWgadlwzWKISJtt6Ku/CnpBrwVy+jFv8StjxsPfwPFzO0CMwdZLJ0/BA==,
+      }
+
   lazystream@1.0.1:
     resolution:
       {
@@ -18147,6 +18165,8 @@ snapshots:
       "@types/ms": 2.1.0
       "@types/node": 26.1.1
 
+  "@types/langs@2.0.5": {}
+
   "@types/luxon@3.7.2": {}
 
   "@types/methods@1.1.4": {}
@@ -21000,6 +21020,8 @@ snapshots:
 
   kolorist@1.8.0: {}
 
+  langs@2.0.0: {}
+
   lazystream@1.0.1:
     dependencies:
       readable-stream: 2.3.8