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/StartView.vue

@@ -11,7 +11,7 @@
           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>
 
@@ -34,7 +34,7 @@
             href="https://www.perplexity.ai/search/what-are-passkeys-v2SHV3yLQlyA2CYH6.Nvhg"
             target="_blank"
           >
-            <fa icon="info-circle" class="fa-fw text-blue-500" />
+            <font-awesome icon="info-circle" class="fa-fw text-blue-500" />
           </a>
         </p>
         <p class="text-center font-light mt-4">
@@ -44,7 +44,7 @@
             href="https://www.perplexity.ai/search/what-is-a-seed-phrase-OqiP9foVRXidr_2le5OFKA"
             target="_blank"
           >
-            <fa icon="info-circle" class="fa-fw text-blue-500" />
+            <font-awesome icon="info-circle" class="fa-fw text-blue-500" />
           </a>
         </p>
         <div class="grid grid-cols-1 sm:grid-cols-2 gap-2 mt-4">