Remove intent model entirely; quick-capture uses primary model

The separate intent model (OLLAMA_INTENT_MODEL / qwen2.5:7b) is removed
from every part of the system. All classification now uses the primary model.

Changes:
- config.py: remove OLLAMA_INTENT_MODEL
- intent.py: remove classify_intent() and all supporting infrastructure
  (_SYSTEM_PROMPT_TEMPLATE, _RESEARCH_PREFIX, _PRIOR_WORK_REFS); file now
  only contains the quick-capture classifier
- quick_capture.py: classify_capture_intent() now called with Config.OLLAMA_MODEL
- generation_task.py: remove intent_model_setting DB lookup and get_setting import;
  history summarization and research pipeline use the primary model directly
- research.py: remove intent_model parameter from run_research_pipeline() and
  _generate_sub_queries(); both use the model param throughout
- routes/settings.py: remove intent_model from model-key validation and response
- app.py: remove intent model pre-warming at startup
- SettingsView.vue: remove Intent Model selector and related refs/state

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/views/SettingsView.vue

@@ -10,10 +10,8 @@ const authStore = useAuthStore();
 const toastStore = useToastStore();
 const assistantName = ref("");
 const defaultModel = ref("");
-const intentModel = ref("");
 const installedModels = ref<string[]>([]);
 const defaultChatModel = ref("");
-const defaultIntentModel = ref("");
 const newEmail = ref("");
 const emailPassword = ref("");
 const changingEmail = ref(false);
@@ -80,10 +78,9 @@ onMounted(async () => {
 
   // Load installed models and configured defaults
   try {
-    const modelsData = await apiGet<{ models: string[]; default_chat_model: string; default_intent_model: string }>("/api/settings/models");
+    const modelsData = await apiGet<{ models: string[]; default_chat_model: string }>("/api/settings/models");
     installedModels.value = modelsData.models;
     defaultChatModel.value = modelsData.default_chat_model;
-    defaultIntentModel.value = modelsData.default_intent_model;
   } catch {
     // Ollama unreachable — dropdowns will be empty
   }
@@ -91,7 +88,6 @@ onMounted(async () => {
   // Load notification preferences from user settings
   const allSettings = await apiGet<Record<string, string>>("/api/settings");
   defaultModel.value = allSettings.default_model ?? "";
-  intentModel.value = allSettings.intent_model ?? "";
   if (allSettings.notify_task_reminders !== undefined) {
     notifyTaskReminders.value = allSettings.notify_task_reminders !== "false";
   }
@@ -190,7 +186,6 @@ async function saveAssistant() {
     await store.updateSettings({
       assistant_name: assistantName.value.trim() || "Fable",
       default_model: defaultModel.value,
-      intent_model: intentModel.value,
     });
     saved.value = true;
     setTimeout(() => (saved.value = false), 2000);
@@ -414,14 +409,6 @@ function hostname(url: string): string {
             </select>
             <p class="field-hint">Model used for new conversations.</p>
           </div>
-          <div class="field">
-            <label for="intent-model">Intent Model</label>
-            <select id="intent-model" v-model="intentModel" class="input">
-              <option value="">Default ({{ defaultIntentModel || "qwen2.5:1.5b" }})</option>
-              <option v-for="m in installedModels" :key="m" :value="m">{{ m }}</option>
-            </select>
-            <p class="field-hint">Smaller/faster model for intent routing before the main model.</p>
-          </div>
         </div>
         <div class="actions">
           <button class="btn-save" @click="saveAssistant" :disabled="saving">