refactor: migrate interfaces to dedicated directory

Reorganizes TypeScript interfaces into a modular structure:
- Create dedicated interfaces directory with specialized files
- Split interfaces by domain (claims, common, limits, records, user)
- Update imports in endorserServer.ts to use new interface locations
- Replace 'any' types with 'unknown' for better type safety
- Add proper type imports and exports

This improves code organization and maintainability by:
- Centralizing interface definitions
- Reducing file size of endorserServer.ts
- Making interface relationships more explicit
- Improving type safety with stricter types

src/views/ContactImportView.vue

@@ -7,7 +7,7 @@
         class="text-lg text-center px-2 py-1 absolute -left-2 -top-1"
         @click="$router.back()"
       >
-        <fa icon="chevron-left" class="fa-fw"></fa>
+        <font-awesome icon="chevron-left" class="fa-fw"></font-awesome>
       </h1>
     </div>
 
@@ -17,7 +17,7 @@
     </h1>
 
     <div v-if="checkingImports" class="text-center">
-      <fa icon="spinner" class="animate-spin" />
+      <font-awesome icon="spinner" class="animate-spin" />
     </div>
     <div v-else>
       <span