chore(frontend): introduce prettier + eslint and prune unused code

- Add Prettier 3 with prettier-plugin-organize-imports (sorts/removes unused imports)
- Add ESLint 10 flat config with typescript-eslint + eslint-plugin-vue + eslint-config-prettier
- Add root scripts: format, format:check, lint, lint:fix
- Reformat 257 files across admin-web, ops-web, desktop-client, packages
- Remove unused locals/exports flagged by --noUnusedLocals/--noUnusedParameters
- Fix duplicate localTabLabel key, surrogate-pair regex u-flag, NBSP literal in regex
- Skip server/ (Go) and apps/browser-extension/ (deprecated per ADR)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop-client/src/main/rate-limiter.ts

@@ -1,18 +1,18 @@
 interface RateLimiterSnapshot {
-  refreshedAt: number;
-  bucketCount: number;
+  refreshedAt: number
+  bucketCount: number
 }
 
 const state: RateLimiterSnapshot = {
   refreshedAt: 0,
   bucketCount: 0,
-};
+}
 
 export function touchRateLimiter(bucketCount: number): void {
-  state.refreshedAt = Date.now();
-  state.bucketCount = bucketCount;
+  state.refreshedAt = Date.now()
+  state.bucketCount = bucketCount
 }
 
 export function getRateLimiterSnapshot(): RateLimiterSnapshot {
-  return { ...state };
+  return { ...state }
 }