Fix 5 wrong API endpoints + stop swallowing JS errors in E2E

Endpoint fixes:
- AuditLog: /api/audit-logs → /api/audit-log
- BugTracker: /api/bugs → /api/bug-reports, create → /api/bug-report
- BugTracker: fix create body (content+priority, not title/description)
- MyDiary: /api/brand-settings → /api/brand
- MyDiary: /api/me/display-name → PUT /api/me
- RecipeSearch: /api/category-modules → /api/categories

Test improvements:
- Remove blanket uncaught:exception swallow (only ignore ResizeObserver)
- Add endpoint-parity.cy.js: intercept-based test that verifies correct
  API endpoints are called and wrong ones are NOT called

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

frontend/src/views/MyDiary.vue

@@ -341,7 +341,7 @@ function formatDate(d) {
 // Brand settings
 async function loadBrandSettings() {
   try {
-    const res = await api('/api/brand-settings')
+    const res = await api('/api/brand')
     if (res.ok) {
       const data = await res.json()
       brandName.value = data.brand_name || ''
@@ -356,7 +356,7 @@ async function loadBrandSettings() {
 
 async function saveBrandSettings() {
   try {
-    await api('/api/brand-settings', {
+    await api('/api/brand', {
       method: 'PUT',
       body: JSON.stringify({
         brand_name: brandName.value,
@@ -400,7 +400,7 @@ async function handleUpload(type, event) {
 // Account
 async function updateDisplayName() {
   try {
-    await api('/api/me/display-name', {
+    await api('/api/me', {
       method: 'PUT',
       body: JSON.stringify({ display_name: displayName.value }),
     })