Adds camelCase support for encrypted field mappings (#342)

Extends encrypted field mappings to include camelCase variants
to support consistency and compatibility with different naming
conventions. Updates reverse mappings for Drizzle ORM to allow
conversion between camelCase and snake_case field names.

Improves integration with systems using mixed naming styles.

src/backend/utils/lazy-field-encryption.ts

@@ -6,6 +6,10 @@ export class LazyFieldEncryption {
     key_password: "keyPassword",
     private_key: "privateKey",
     public_key: "publicKey",
+    // Reverse mappings for Drizzle ORM (camelCase -> snake_case)
+    keyPassword: "key_password",
+    privateKey: "private_key",
+    publicKey: "public_key",
   };
 
   static isPlaintextField(value: string): boolean {