Fix all ESLint errors: remove unused imports, replace any types

- Remove ~60 unused imports and variables across 88 files
- Replace ~80 `any` type annotations with proper types (unknown,
  Record<string, unknown>, or specific types)
- Prefix unused callback args with underscore
- Fix unescaped JSX entities
- Lint now passes cleanly (0 errors, 2 intentional img warnings)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/services/clients.service.ts

@@ -192,8 +192,8 @@ export async function updateClient(
     action: 'update',
     entityType: 'client',
     entityId: id,
-    oldValue: diff as any,
-    newValue: data as any,
+    oldValue: diff as Record<string, unknown>,
+    newValue: data as Record<string, unknown>,
     ipAddress: meta.ipAddress,
     userAgent: meta.userAgent,
   });
@@ -312,7 +312,7 @@ export async function updateContact(
   clientId: string,
   portId: string,
   data: Partial<{ channel: string; value: string; label: string; isPrimary: boolean; notes: string }>,
-  meta: AuditMeta,
+  _meta: AuditMeta,
 ) {
   const client = await db.query.clients.findFirst({
     where: eq(clients.id, clientId),
@@ -339,7 +339,7 @@ export async function removeContact(
   contactId: string,
   clientId: string,
   portId: string,
-  meta: AuditMeta,
+  _meta: AuditMeta,
 ) {
   const client = await db.query.clients.findFirst({
     where: eq(clients.id, clientId),