fix: use HTML-safe expressions for @input handlers in Vue templates

Replace `<` comparisons with Math.max/ternary+>= to avoid Vue template
parser treating `<` as HTML tag start in attribute values.

frontend/src/components/account/BulkEditAccountModal.vue

@@ -496,7 +496,7 @@
             class="input"
             :class="!enableConcurrency && 'cursor-not-allowed opacity-50'"
             aria-labelledby="bulk-edit-concurrency-label"
-            @input="if (concurrency < 1) concurrency = 1"
+            @input="concurrency = Math.max(1, concurrency || 1)"
           />
         </div>
         <div>
@@ -525,7 +525,7 @@
             class="input"
             :class="!enableLoadFactor && 'cursor-not-allowed opacity-50'"
             aria-labelledby="bulk-edit-load-factor-label"
-            @input="if (loadFactor != null && loadFactor < 1) loadFactor = null"
+            @input="loadFactor = (loadFactor &amp;&amp; loadFactor >= 1) ? loadFactor : null"
           />
           <p class="input-hint">{{ t('admin.accounts.loadFactorHint') }}</p>
         </div>

frontend/src/components/account/CreateAccountModal.vue

@@ -1753,13 +1753,13 @@
         <div>
           <label class="input-label">{{ t('admin.accounts.concurrency') }}</label>
           <input v-model.number="form.concurrency" type="number" min="1" class="input"
-            @input="if (form.concurrency < 1) form.concurrency = 1" />
+            @input="form.concurrency = Math.max(1, form.concurrency || 1)" />
         </div>
         <div>
           <label class="input-label">{{ t('admin.accounts.loadFactor') }}</label>
           <input v-model.number="form.load_factor" type="number" min="1"
             class="input" :placeholder="String(form.concurrency || 1)"
-            @input="if (form.load_factor != null && form.load_factor < 1) form.load_factor = null" />
+            @input="form.load_factor = (form.load_factor &amp;&amp; form.load_factor >= 1) ? form.load_factor : null" />
           <p class="input-hint">{{ t('admin.accounts.loadFactorHint') }}</p>
         </div>
         <div>

frontend/src/components/account/EditAccountModal.vue

@@ -654,13 +654,13 @@
         <div>
           <label class="input-label">{{ t('admin.accounts.concurrency') }}</label>
           <input v-model.number="form.concurrency" type="number" min="1" class="input"
-            @input="if (form.concurrency < 1) form.concurrency = 1" />
+            @input="form.concurrency = Math.max(1, form.concurrency || 1)" />
         </div>
         <div>
           <label class="input-label">{{ t('admin.accounts.loadFactor') }}</label>
           <input v-model.number="form.load_factor" type="number" min="1"
             class="input" :placeholder="String(form.concurrency || 1)"
-            @input="if (form.load_factor != null && form.load_factor < 1) form.load_factor = null" />
+            @input="form.load_factor = (form.load_factor &amp;&amp; form.load_factor >= 1) ? form.load_factor : null" />
           <p class="input-hint">{{ t('admin.accounts.loadFactorHint') }}</p>
         </div>
         <div>